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Keep sensitive data out of application logs by deciding what each event needs to record before it is emitted. Log a small set of reviewed fields—such as the action, outcome, timestamp, service, and a safe actor or interaction reference—instead of whole requests, responses, or exception objects. Then apply shared controls, check integrations that may capture raw data, and protect the logs that remain.
Why sensitive data ends up in logs
Logging becomes risky when applications capture more than an event needs: a complete request or response, an unfiltered query string, arbitrary exception details, or verbose diagnostic output. Sensitive values can also be copied into error-tracking and application-performance-monitoring (APM) services. OWASP’s secure logging benchmark reports that 44.1% of respondents had encountered sensitive information in logs, 35.3% had found authentication information, and 43.1% had encountered excessive diagnostic detail. The benchmark page does not establish the survey year, population, sample size, or methodology, so these figures should not be treated as prevalence estimates for all organizations. OWASP Secure Logging Benchmark
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Choose the minimum useful fields for each event
Start with the event’s purpose, then select fields that help answer the operational or security question. OWASP describes useful logging context in terms of when, where, who, and what. Those categories do not require copying the protected data involved.
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- Where: the service or component that emitted the event.
- Who: a safe actor identifier or pseudonymous reference, when needed.
- What: the action and its result, such as access granted or denied.
- Correlation: an interaction identifier that helps connect related events without carrying a credential or personal record.
For example, a sensitive-record access event can report that a user accessed a record, when it happened, which service handled it, and whether access succeeded. It need not include the record’s contents. OWASP recommends including security-event logging in applications; see its Logging Cheat Sheet.
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Use explicit fields, not whole objects
Construct events from named, reviewed fields rather than serializing entire request objects, responses, or application state. Classify fields and exclude secrets and sensitive personal information by default. In particular, do not directly log:
- Passwords, access tokens, session tokens, or other authentication material.
- Encryption keys or database connection strings.
- Payment-card data or sensitive personal data.
- Request or response bodies, query strings, exception arguments, or other raw input unless a specific, reviewed need justifies a safe representation.
If an investigation genuinely needs a reference to a sensitive value, decide whether omission, masking, hashing, or pseudonymization serves that purpose. These are options to assess, not automatic approval to log the field: hashing may still allow identification or recovery in some circumstances. OWASP’s Secrets Management Cheat Sheet says secrets should never be logged in plaintext and calls for encryption or masking to avoid that outcome. For session identifiers, consult the Session Management Cheat Sheet.
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Inspect the common leak paths
Review both application code and the systems that receive its telemetry. A field omitted by one logging call may still be captured by a framework, diagnostic setting, or external integration.
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- Request bodies, response bodies, query strings, and URL fragments.
- Database connection strings and configuration output.
- Exception messages, exception objects, and their arguments, which can contain credentials or user-supplied values.
- Verbose or debug logging, framework and library diagnostics, and automatic request capture.
- Error trackers and APM tools that forward raw request data.
Where reports include URLs, strip query strings or fragments if they can carry sensitive values. OWASP’s Web Security Testing Guide: Application Platform Configuration identifies verbose logging, request/response capture, exceptions containing credentials, and third-party forwarding as areas to check.
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Sanitize untrusted input before logging it
Values that cross a trust boundary can create forged log entries or disrupt downstream parsing. Validate and encode them for the log format, and handle carriage returns, line feeds, and delimiter characters as appropriate. Structured logging can preserve the boundary between fields and values, but it does not prevent an application from placing a secret or personal data in a field. OWASP’s Implement Security Logging and Monitoring guidance covers logging controls and safe handling.
Enforce rules centrally and test failure cases
Put shared rules in an application-wide logging handler or an approved framework mechanism so that components inherit consistent controls. Review configuration before production, then test representative events and failures rather than checking only the happy path.
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- Define event types and their purpose, including the minimum fields needed for investigation.
- Build events from approved fields; exclude secrets and sensitive personal information by default.
- Configure shared filtering and sanitization, including protection against untrusted line breaks and delimiters.
- Exercise successful and denied actions, malformed input, and exceptions; inspect the resulting output for raw payloads or credentials.
- Review debug settings, framework diagnostics, error trackers, and APM integrations to confirm they do not capture excluded data.
- Scan existing logs for leaked secrets and sensitive values, then address affected stores and copies.
The OWASP Logging Vocabulary Cheat Sheet provides terminology useful for designing consistent event fields.
Protect logs after they are collected
Prevention at the point of emission is the main safeguard; storage controls limit the consequences of anything that remains. Treat logs as sensitive assets, with controls appropriate to their contents and operational role.
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- Restrict read privileges to people and services that need them, and review access periodically.
- Record and monitor access to logs; consider integrity or tamper detection.
- Protect log transmission over untrusted networks.
- Detect when expected logging stops, so a failure or interruption does not silently remove visibility.
- Set and enforce a retention and disposal schedule for primary logs, copies, and backups. Balance legal, regulatory, and contractual obligations against the principle of keeping data no longer than necessary.
There is no universal retention duration or single redaction method that fits every data type and organization. Determine the period and treatment from the log’s purpose, sensitivity, and applicable obligations.
Quick Recap
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