OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup

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.

Scores

EPSS (exploitation in 30 days)

0.17% · top 93% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: poc · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

• CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition (opens in a new tab)All about CWE-367 and its CVEs
• CWE-639: Authorization Bypass Through User-Controlled Key (opens in a new tab)All about CWE-639 and its CVEs

Affected products

• opf · openproject

  • affected < 17.3.0

References (2)

• https://github.com/opf/openproject/security/advisories/GHSA-hh5p-gwf8-h245 (opens in a new tab)x_refsource_CONFIRMexploit
• https://github.com/opf/openproject/commit/8f693a1f35d0a84bb69af78fb6925f74329ae4fe (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-40896](https://trackcve.app/badge/CVE-2026-40896.svg)](https://trackcve.app/cve/CVE-2026-40896)

Record last updated 20 Apr 2026, 16:13 UTC.