CVE-2026-40896 — OpenProject is open-source, web-based project management
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 projects they have no access to. No knowledg
What This Means For You
- If your environment is affected by CWE-367, CWE-639, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-40896 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-40896 - OpenProject Unauthenticated Agenda Item Injection
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-40896 | vulnerability | CVE-2026-40896 |
| CWE-367 | weakness | CWE-367 |
| CWE-639 | weakness | CWE-639 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 20, 2026 at 19:16 UTC |
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