Auth bypass in Openproject
CVE-2026-40896
OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even…
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
EPSS: 0.002 (7.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Openproject
- Opf Openproject — versions < 17.3.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-40896?
- CVE-2026-40896 is a medium-severity vulnerability in Openproject, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.5/10. Published 2026-04-20.
- How severe is CVE-2026-40896?
- Medium severity. CVSS v3 base score is 6.5 out of 10.