Account compromise via unthrottled password-change attempts
Published Jan 10, 2026 · Updated Jan 10, 2026
Brute-force exposure in OpenProject before 16.6.2 allows remote attackers to compromise accounts through the password-change endpoint. The change_password_flow logic checks submitted current passwords without recording failed attempts or enforcing the login lockout threshold. Reachability is unauthenticated, but exploitation requires a known or enumerable user ID and a correct password guess; success grants the targeted user's access.
Summary
What happened
Brute-force exposure in OpenProject before 16.6.2 allows remote attackers to compromise accounts through the password-change endpoint. The change_password_flow logic checks submitted current passwords without recording failed attempts or enforcing the login lockout threshold. Reachability is unauthenticated, but exploitation requires a known or enumerable user ID and a correct password guess; success grants the targeted user's access.
The record
- CVE
- CVE-2026-22603
- Published
- Jan 10, 2026
- Updated
- Jan 10, 2026
- Vendor
- OpenProject GmbH
- Product
- OpenProject
- Classifications
- CWE-307, CAPEC-49, T1110.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 10, 2026CVE publishedPublication date reported by the CVE source.
- Jan 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 16.6.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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