What is CVE-2026-40896?

CVE-2026-40896 is a medium-severity vulnerability in Opf 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.

Auth bypass in Opf 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: 0.000 (9.9th 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

Opf Openproject — versions < 17.3.0

Weakness classification (CWE)

References

https://github.com/opf/openproject/security/advisories/GHSA-hh5p-gwf8-h245 (x_refsource_CONFIRM)
https://github.com/opf/openproject/commit/8f693a1f35d0a84bb69af78fb6925f74329ae4fe (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40896?: CVE-2026-40896 is a medium-severity vulnerability in Opf 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.