Rejetto HFS 3.0.0 through 3.2.0 are listed as affected by CVE-2026-61500, a remote session-forgery vulnerability that can lead to administrative access. OSV’s record identifies 3.2.1 as the first fixed release; the project’s release listing surfaced 3.3.4 as its latest release when checked. A vulnerable version reachable by untrusted parties should be treated as potentially exposed, but reachability alone does not prove an attacker succeeded.
Is Rejetto HFS exposed?
Exposure depends on both the installed version and who can reach the server. The OSV record for CVE-2026-61500 lists Rejetto HFS 3.0.0 through 3.2.0 as affected and describes remote session forgery that can lead to administrative access. The record names 3.2.1 as the first fixed release and links to the upstream release.
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- Version: If your HFS 3 installation is between 3.0.0 and 3.2.0 inclusive, it falls within the affected range stated in the record.
- Reachability: If untrusted parties could connect to the affected server, treat it as potentially exposed. A server limited to trusted networks has a different exposure profile, though that does not make an affected build fixed.
- Compromise: Being reachable or running an affected version does not by itself show that anyone exploited it.
The VulnCheck CNA record represented by OSV gives the CVE a CVSS 3.1 score of 9.8. The reviewed sources do not establish an exploitation rate or incident count. This vulnerability record concerns HFS 3.x; it does not establish whether HFS 2.x is affected.
Which HFS version should I patch to?
Upgrade to the current stable release available from the HFS releases page. The release listing surfaced version 3.3.4 as latest and said it contains security fixes; release status can change, so check the page when planning the update. The vulnerability record’s minimum fix is 3.2.1, but choosing the current stable release avoids stopping at that minimum when later releases are available.
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- Confirm your installed version. Check the version shown by your HFS installation or its administration interface, then compare it with the affected range in the OSV record.
- Obtain the current stable release. Use the project’s release page and follow its release-specific installation instructions.
- Verify the upgrade. After updating, confirm that HFS reports the new version and that the service is operating as expected.
What should I review in HFS configuration?
HFS documentation identifies config.yaml as the configuration file and describes the virtual file system, accounts, and logging settings. Review these settings to understand what the server makes available and which users can access or change it. See the HFS 3 configuration documentation.
- Virtual file system: Check the folders and content exposed by the server, including whether any shared path is broader than intended.
- Accounts and permissions: Confirm that accounts and their access rights still match the people and tasks that need them.
- Logging: Check that logging is configured in a way that supports review of activity relevant to your installation.
If HFS sits behind a reverse proxy, verify that its proxy-forwarding configuration reflects the real proxy chain. The maintainer says forwarding is disabled by default for security reasons and must be configured with the correct number of proxies when used. Incorrect proxy settings can create a security threat; see the HFS discussion about X-Forwarded-For.
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How can I check for signs of compromise?
Review HFS logs for activity that does not fit the server’s expected use. The maintainer describes filtering the admin-panel log’s notes column for upload entries. Unexpected uploads merit investigation, but an upload entry alone does not prove exploitation, and the sources do not provide a definitive list of indicators that confirms or rules out compromise. See the HFS maintainer guidance on filtering administrator logs.
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- Review whether unexpected uploads or other logged actions correspond to content and accounts exposed by the virtual file system and configuration.
- Do not treat the absence of a particular log entry as proof that no exploit occurred.
If you suspect an incident, preserve relevant logs and investigate using an incident-response process appropriate to your environment. The HFS sources cited here do not provide a complete forensic or recovery playbook, so validate suspicious evidence in context rather than relying on a single symptom.
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How should administrators report a security issue?
For a newly discovered security problem in HFS, the project’s security policy asks users to contact the maintainers privately at [email protected] so a fix can be prepared before public disclosure.
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