CVE-2026-44731: CWE-639: Authorization Bypass Through User-Controlled Key in opf openproject
OpenProject is open-source, web-based project management software. Prior to 17.3.2 and 17.4.0, the web application's meetings filter feature leaks whether a given user ID corresponds to a valid account and discloses the user's full name, allowing an attacker to enumerate all existing user accounts by probing user IDs and observing differences in the server response. This vulnerability is fixed in 17.3.2 and 17.4.0.
AI Analysis
Technical Summary
CVE-2026-44731 is an authorization bypass vulnerability (CWE-639) in the OpenProject web-based project management software. The vulnerability exists in the meetings filter feature, which leaks information about user validity and full names based on user ID probes. This allows an attacker with low privileges to enumerate existing user accounts by observing differences in server responses. The vulnerability affects versions prior to 17.3.2 and 17.4.0 and has been addressed in these fixed versions.
Potential Impact
An attacker can enumerate valid user accounts and obtain full names by probing user IDs through the meetings filter feature. This information disclosure can aid in further targeted attacks or social engineering but does not directly impact data integrity or availability.
Mitigation Recommendations
Upgrade OpenProject to version 17.3.2 or 17.4.0 or later, where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory.
CVE-2026-44731: CWE-639: Authorization Bypass Through User-Controlled Key in opf openproject
Description
OpenProject is open-source, web-based project management software. Prior to 17.3.2 and 17.4.0, the web application's meetings filter feature leaks whether a given user ID corresponds to a valid account and discloses the user's full name, allowing an attacker to enumerate all existing user accounts by probing user IDs and observing differences in the server response. This vulnerability is fixed in 17.3.2 and 17.4.0.
CVSS v3.1
Score 4.3medium
Affected software
pkg:github/opf/openprojectRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-44731 is an authorization bypass vulnerability (CWE-639) in the OpenProject web-based project management software. The vulnerability exists in the meetings filter feature, which leaks information about user validity and full names based on user ID probes. This allows an attacker with low privileges to enumerate existing user accounts by observing differences in server responses. The vulnerability affects versions prior to 17.3.2 and 17.4.0 and has been addressed in these fixed versions.
Potential Impact
An attacker can enumerate valid user accounts and obtain full names by probing user IDs through the meetings filter feature. This information disclosure can aid in further targeted attacks or social engineering but does not directly impact data integrity or availability.
Mitigation Recommendations
Upgrade OpenProject to version 17.3.2 or 17.4.0 or later, where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-07T18:04:17.309Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3edc0372d29f1837f4649b
Added to database: 06/26/2026, 20:07:31 UTC
Last enriched: 06/26/2026, 20:22:46 UTC
Last updated: 06/26/2026, 21:02:35 UTC
Views: 6
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