Openproject
CVE-2026-22603
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
OpenProject is an open-source, web-based project management software. Prior to version 16.6.2, OpenProject’s unauthenticated password-change endpoint (/account/change_password) was not protected by the same brute-force safeguards that apply to the normal login form. In affected versions, an attacker who can guess or enumerate user IDs can send unlimited password-change requests for a given account without triggering lockout or other rate-limiting controls. This allows automated password-guessing (e.g., with wordlists of common passwords) against valid accounts. Successful guessing results in full account compromise for the targeted user and, depending on that user’s role, can lead to further privilege escalation inside the application. This issue has been patched in version 16.6.2. Those who are unable to upgrade may apply the patch manually.
AnalysisAI
OpenProject versions prior to 16.6.2 fail to implement rate-limiting on the unauthenticated password-change endpoint, allowing attackers to conduct brute-force attacks against known user accounts without triggering lockout mechanisms. An attacker can systematically guess passwords using common wordlists and achieve full account compromise, potentially escalating privileges depending on the victim's role within the application. A patch is available in version 16.6.2.
Technical ContextAI
This vulnerability (CWE-307: Improper Restriction of Excessive Authentication Attempts) affects Openproject. OpenProject is an open-source, web-based project management software. Prior to version 16.6.2, OpenProject’s unauthenticated password-change endpoint (/account/change_password) was not protected by the same brute-force safeguards that apply to the normal login form. In affected versions, an attacker who can guess or enumerate user IDs can send unlimited password-change requests for a given account without triggering lockout or other rate-limiting controls. This allows automated password-guessing
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 16.6.2.. Restrict network access to the affected service where possible.
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Same technique Privilege Escalation
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External POC / Exploit Code
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