Vulnerability · Published Apr 20, 2026 · Assigned by GitHub_M
CVE-2026-40896OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup
Medium 6.5
In plain English
A medium-severity authorization bypass via user-controlled key in openproject from opf. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Official description
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 projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| opf | openproject | < 17.3.0 |
Weakness: CWE-367, CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N