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Vulnerabilities

Security fix · CVE-2026-22604

OpenProject is an open-source, web-based project management software.

Published Jan 10, 2026 · catalog updated Jan 12, 2026 · OpenProject is an open-source,

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-22604. EPSS is 0.30%. Act only if a listed version of OpenProject is an open-source, is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OpenProject is an open-source,).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.30%
Remediation
Version ranges on file
Affected products
vendor opf openproject 11.2.1, < 16.6.2

OpenProject is an open-source, web-based project management software. For OpenProject versions from 11.2.1 to before 16.6.2, when sending a POST request to the /account/change_password endpoint with an arbitrary User ID as the password_change_user_id parameter, the resulting error page would show the username for the requested user. Since this endpoint is intended to be called without being authenticated, this allows to enumerate the user names of all accounts registered in an OpenProject instance. This issue has been patched in version 16.6.2.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor opf openproject 11.2.1, < 16.6.211.2.1, < 16.6.2

How to fix CVE-2026-22604

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-22604. EPSS is 0.30%. Act only if a listed version of OpenProject is an open-source, is installed.

Which versions are affected?

Compare what you have installed with opf openproject 11.2.1, < 16.6.2 11.2.1, < 16.6.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.30%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 10, 2026 · EUVD

    Detected

    OpenProject is an open-source, web-based project management software. For OpenProject versions from 11.2.1 to before 16.6.2, when sending a POST request to the /account/change_password endpoint with an arbitrary User ID as the password_change_user_id parameter, the resulting error page would show the username for the requested user. Since this endpoint is intended to be called without being authen

  2. Jan 12, 2026 · EUVD

    Updated

    OpenProject is an open-source, web-based project management software. For OpenProject versions from 11.2.1 to before 16.6.2, when sending a POST request to the /account/change_password endpoint with an arbitrary User ID as the password_change_user_id parameter, the resulting error page would show the username for the requested user. Since this endpoint is intended to be called without being authen

Sources

  • CVE.orgVulnerability recordCVE-2026-22604

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-22604

    30-day exploitation probability 0.30%

    first.org
  • EUVDVulnerability recordEUVD-2026-1883

    OpenProject is an open-source, web-based project management software. For OpenProject versions from 11.2.1 to before 16.6.2, when sending a POST request to the /account/change_password endpoint with an arbitrary User ID as the password_change_user_id parameter, the resulting erro

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 3, 2026
  • CVE.orgOct 30, 2026
  • EUVDOct 30, 2026