User Enumeration Flaw in OpenProject by OPF
CVE-2026-22604

6.9MEDIUM

Key Information:

Vendor

Opf

Status
Openproject
Vendor
CVE Published:
10 January 2026

What is CVE-2026-22604?

OpenProject, a popular open-source project management tool, is vulnerable to user enumeration through its /account/change_password endpoint. Versions ranging from 11.2.1 to before 16.6.2 allow attackers to bypass authentication requirements while attempting to change a user's password. By manipulating the password_change_user_id parameter in a POST request, attackers can elicit error messages that reveal whether specific usernames exist within the system. This flaw presents significant risks, as it enables unauthorized users to compile lists of valid usernames, facilitating further attacks. The vulnerability has been addressed in version 16.6.2.

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Affected Version(s)

openproject >= 11.2.1, < 16.6.2

References

https://github.com/opf/openproject/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/opf/openproject/pull/3451
x_refsource_MISC
https://github.com/opf/openproject/commit/2cff5e98649e32a...
x_refsource_MISC

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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