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The safest design grants only events:PutEvents to a named account or your AWS Organization. Add rule-management permissions such as events:PutRule and events:PutTargets only when the external account truly needs to administer rules on the bus.
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How EventBridge cross-account authorization works
EventBridge event-bus access is controlled by a resource-based policy attached to the bus. The default bus permits events from its own account by default; another account cannot publish to it until the bus policy explicitly grants access.
A working cross-account path has three independent pieces:
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- Receiving account: the destination bus policy authorizes the sender account, or accounts in an AWS Organization, to call the permitted EventBridge actions.
- Sending account: a rule forwards matching events to the destination bus ARN. For new cross-account targets created after March 2, 2023, that target also has an IAM role.
- Receiving account: rules on the destination bus match the incoming events and invoke local targets.
Granting access to the bus does not automatically create a forwarding rule, and creating a forwarding rule does not bypass the destination bus policy. Both sides must be configured. Treat authorization, transport, and matching as separate checkpoints. That separation makes it possible to identify whether a failure is caused by policy, target configuration, or an event pattern.
Choose exactly what the other account may do
Start with the narrowest operation that satisfies the integration. EventBridge uses the events: action prefix.
| Permission | What it allows | Typical cross-account use |
|---|---|---|
events:PutEvents |
Add custom events to the bus | Normal sender-to-receiver delivery |
events:PutRule |
Create or update rules | Only when another account must administer rules on the bus |
events:PutTargets |
Add targets to a rule | Only when another account must attach or change rule targets |
Sending permission and rule-management permission are separate decisions. A workload that only publishes events should receive events:PutEvents, not the ability to create rules or attach targets. If delegated administration is required, constrain those statements to the appropriate bus and rules and, where suitable, to the creator account. AWS examples use a creator-account condition in rule-management permissions.
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Scope the principal to one account or an organization
A specific AWS account principal is easiest to reason about when the integration has a known producer. An organization-scoped statement is useful when many accounts in the same AWS Organization must publish, but it must include the organization ID condition and still be paired with careful event-pattern filtering.
| Authorization scope | Best fit | Security consideration |
|---|---|---|
| Named account ID | One known producer account | Limits publication to that account |
| AWS Organization ID condition | Multiple accounts governed by one organization | Use the real organization ID and keep only the required actions |
Choose the named-account option when the producer list changes rarely or when separate business units should have visibly different permissions. Choose the organization condition when accounts are added and removed under one organization boundary and maintaining individual statements would be cumbersome. In either case, the event pattern on the receiving bus remains an important control: authorization decides who may submit an event, while the pattern decides which submitted events activate processing.
Configure the receiving event-bus policy
Use the EventBridge console
- Sign in to the receiving AWS account.
- Open EventBridge and choose Event buses.
- Select the destination bus.
- Choose Manage permissions.
- Enter or customize the policy, then choose Update.
The console supplies a policy template, but AWS states that “The template isn’t a valid policy.” Treat it as a starting point: replace illustrative principals and resources, remove example statements that do not apply, and retain only the actions needed for your design. A template can contain examples for more than one use case; applying it unchanged may grant access that your architecture never intended.
Before saving, verify three values in every statement: the principal, the action, and the resource. The principal should identify the sending account or the intended organization condition. The action should be the smallest EventBridge operation required. The resource should be the exact destination bus, including the destination Region, receiving account ID, and bus name.
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Minimal policy for one sender account
The following is a conceptual statement for send-only access. Replace the example account IDs, Region, and bus name with the real values for your environment.
{
"Sid": "AllowSenderToPutEvents",
"Effect": "Allow",
"Principal": {
"AWS": "111122223333"
},
"Action": "events:PutEvents",
"Resource": "arn:aws:events:us-east-1:444455556666:event-bus/example-bus"
}The principal is the sender account ID. The resource is the receiving bus ARN, including its Region, receiving account ID, and bus name. Do not leave the illustrative values in production. If the destination uses a custom bus rather than the default bus, ensure the name in the ARN is that custom bus name. A policy on a bus in the sender account cannot authorize calls to a bus in the receiving account.
Organization-scoped authorization
For organization-wide access, AWS’s policy pattern uses a wildcard principal together with a StringEquals condition on aws:PrincipalOrgID. Substitute your actual organization ID and remove unrelated statements from the template. A broad principal without the organization condition would authorize far more accounts than intended.
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Keep rule-management statements separate from the send statement. This makes review and later removal safer: you can revoke administration without interrupting event publication. If only some organization accounts should publish a particular event class, use separate buses or more narrowly scoped statements rather than assuming the organization condition distinguishes those accounts.
Configure the sender-side forwarding rule
After the destination bus authorizes the sender, configure a rule in the sending account. The rule determines which source events leave that account and where they go. The rule’s event pattern is therefore part of the access design: a broad pattern can forward many more events than the receiver expects, increasing cost and operational noise.
- Open EventBridge in the sending account.
- Create or edit the rule that should forward events.
- When selecting the target, choose EventBridge event bus.
- Select Event bus in a different account or Region.
- Enter the receiving bus ARN.
- Complete the target configuration and save the rule.
The target ARN identifies the destination bus; it is not the ARN of a rule or another target. EventBridge APIs that accept a bus Name can also accept a bus ARN, which permits cross-account or cross-Region bus references in those API calls. Copy the ARN from the receiving account or construct it carefully; a wrong account ID, Region, or bus name sends the request to the wrong resource or causes authorization failure.
IAM role requirement for new cross-account targets
AWS requires an IAM role for new cross-account event-bus targets created after March 2, 2023. The EventBridge console creates the role during target setup. If you use the AWS CLI, create the role yourself and associate it with the target.
AWS recommends using IAM roles when a rule targets an event bus. Roles also allow organization boundaries enforced with service control policies to apply to the target operation. The role requirement applies to the target configuration on the sending side; it does not replace the resource-based policy on the receiving bus. You need both: the sender-side target must be able to assume and use its configured role, and the receiver-side bus must trust the sender account for the permitted bus action.
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Older targets may predate the March 2, 2023 requirement, but do not infer that a newly created target can omit the role because a similar old rule did. Test new configurations against the current behavior, particularly when recreating a rule, changing its target, or moving the setup to another Region.
Match incoming events on the receiving bus
The receiving bus can accept an event while no downstream action occurs unless a receiving rule matches it. Create rules in the receiving account for the sources, detail types, and accounts that should trigger processing. A bus policy is an admission control; a receiving rule is the routing decision after admission.
Match one authorized sender
Include the sender account ID in the receiving rule’s event pattern when the rule is intended for that account. This prevents an event with otherwise identical fields from another account from invoking the rule. Account filtering is especially useful when several producers use the same source or detail type but should trigger different processing paths.
Accept events from several authorized accounts
If a rule should process events from any authorized sender, omit the account field rather than writing a literal *. A literal asterisk in the account field does not match every account. Authorization remains controlled by the bus policy, while the event pattern controls which accepted events reach the rule.
When account filtering is omitted, retain other discriminators such as source and detail type so that unrelated events do not invoke the target. If different senders need different handling, create separate rules with explicit account lists or account-specific patterns instead of one broad rule.
Protect broad organization or multi-account intake
When accepting events from all AWS accounts, AWS strongly recommends including account IDs in receiving rule patterns so events from unknown accounts do not match accidentally. Combine account filtering with source and detail-type conditions appropriate to the application. Organization-level authorization and event-pattern filtering solve different problems: the organization condition limits who can call the bus, while the pattern limits which accepted events are processed.
Same-Region and cross-Region behavior
Cross-account event delivery works between accounts in the same Region. It can also work across Regions when the destination Region supports cross-Region event delivery. Confirm that the selected destination Region supports the feature before relying on a cross-Region design.
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Billing and forwarding limits
The sending account pays for cross-account events as custom events. The receiving account is not charged for receiving those events under the documented cross-account flow. Because the sender is the payer, review forwarding patterns in the sender account and avoid forwarding events that the receiver will never match.
The documented receiver-to-third-account forwarding pattern does not deliver events onward to a third account. Do not assume that an event arriving on a receiving bus can automatically be relayed through that bus to another account; design any additional hop separately and verify the supported routing model for your Regions and event types. A two-account design should not quietly become a multi-hop topology without explicit policies, targets, and cost review.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Security design checklist
- Use a named sender account when the producer set is known.
- For organization-wide access, require the real
aws:PrincipalOrgIDvalue. - Grant
events:PutEventsindependently fromevents:PutRuleandevents:PutTargets. - Constrain rule-management permissions to the intended bus and rules, with a creator-account condition where appropriate.
- Use the complete destination bus ARN, including account ID, Region, and bus name.
- For new cross-account targets created after March 2, 2023, configure the required sending-side IAM role.
- Add sender account IDs to receiving event patterns whenever a rule is account-specific.
- Do not use
"account": "*"as a catch-all pattern; omit the field for any authorized sender and rely on policy plus other pattern fields. - Review the policy template instead of applying it unchanged.
- Keep sender and receiver account IDs, Regions, and bus names in the change record so reviewers can verify every ARN.
- Test a controlled event before enabling broad production forwarding.
Troubleshoot a cross-account EventBridge setup
The sender receives an authorization error
Check the receiving bus policy first. Confirm that the principal is the sender account ID or the intended organization condition, that the action is events:PutEvents, and that the resource is the exact destination bus ARN. A policy on the sender’s bus does not grant access to the receiver’s bus. Also check for a Region mismatch: a correctly written statement for one regional bus does not automatically cover another regional bus.
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The rule saves but events never arrive
Verify that the sender rule’s event pattern matches the events being generated and that its target is the receiving bus ARN, not a similarly named local bus. Then inspect the receiving bus policy and confirm that the destination Region and account are correct. If the rule was created through the CLI, confirm that the required IAM role was created and attached for this new cross-account target.
Events arrive but no receiver target runs
The bus may be receiving events successfully while no receiving rule matches them. Check the receiving rule’s source, detail type, and account conditions. If you intended to accept multiple authorized senders, remove an overly restrictive account condition; if you intended one sender, correct the account ID rather than using a wildcard. Remember that "account": "*" is not a catch-all.
The console asks for a role
For a new cross-account event-bus target, this is expected after the March 2, 2023 policy change. Allow the console to create the role, or create and attach the required role manually when using the CLI. The role prompt does not eliminate the need for a destination bus policy.
A delegated administrator can publish but cannot create rules
That behavior indicates the policy grants send-only access. Add narrowly scoped events:PutRule and, if needed, events:PutTargets permissions only after confirming that delegated rule management is required. Review any creator-account condition and the target resource scope at the same time.
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Only some events trigger processing
Compare a received event with the receiving rule’s source, detail-type, and account conditions. A policy can admit an event even when the rule intentionally ignores it. If several accounts publish similar events, verify that the account field is either the intended sender ID or omitted deliberately for a multi-account rule.
Recommended rollout sequence
- Record the sender account ID, receiving account ID, bus name, and Region.
- Decide whether access is for one account or an AWS Organization.
- Decide whether the external account needs send-only access or delegated rule administration.
- Write the receiving bus policy with only the required EventBridge actions.
- Apply and review the policy in Event buses → Manage permissions.
- Create the sender rule and target the complete receiving bus ARN.
- Configure the IAM role required for a new cross-account target.
- Create receiving rules with account, source, and detail-type filters.
- Send a controlled test event and verify both bus arrival and downstream rule execution.
- Review CloudTrail and EventBridge metrics according to your operational practices, then remove temporary broad permissions.
This sequence separates authorization, transport, and matching. When a test fails, you can identify whether the problem is the bus policy, the sender rule and role, or the receiver rule pattern instead of changing all three at once.
Frequently Asked Questions
How do I allow another AWS account to put events on my EventBridge event bus?
In the receiving account, attach a resource-based policy to the destination bus that grants the sender account events:PutEvents. In the sending account, create a rule whose target is the destination bus ARN. For a new cross-account target created after March 2, 2023, configure the required IAM role, then create receiving rules that match the events.
Do I need an IAM role to send events to another account?
New cross-account event-bus targets created after March 2, 2023 require a sending-side IAM role. The console creates it during target setup; with the CLI, create and associate it yourself. The role does not replace the resource-based policy on the receiving bus.
Can I grant access to every account in my AWS Organization?
Yes. Use the organization-scoped policy pattern with a wildcard principal and a StringEquals condition on aws:PrincipalOrgID. Substitute your real organization ID and grant only the actions required. Add account filtering to receiving rules when only particular accounts should trigger processing.
What permissions are required for a sender that only publishes events?
Grant events:PutEvents on the receiving bus. Do not add events:PutRule or events:PutTargets unless the other account must create or administer rules.
Why does my receiving rule not match every account?
If the event pattern contains an account value, it filters to that account. To match events from any authorized sender, omit the account field; a literal * does not act as a wildcard for this purpose.
Who pays for cross-account EventBridge events?
The sending account pays for the events as custom events. The receiving account is not charged for receiving them under the documented cross-account flow.
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Do not assume it can. The documented receiver-to-third-account forwarding pattern does not deliver events onward to a third account. Any additional hop requires a separately designed and verified routing configuration.
Can cross-account buses be in different Regions?
Yes, when the destination Region supports cross-Region event delivery. Use the destination Region in the bus ARN and configure the policy on that exact regional bus.
The Bottom Line
Cross-account EventBridge access is a two-account configuration: authorize the sender on the receiving bus, target that bus from a sender-side rule with the required post–March 2, 2023 IAM role, and filter accepted events with receiving rules. Keep send permission separate from rule administration, use account or organization scoping deliberately, and verify the exact ARN, Region, and event pattern at every step.
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