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CVE-2026-40896

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

Published: Apr 20, 2026Updated: Apr 20, 2026 Sources: CVE List
NVD MITRE
6.5CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None

Weaknesses

CWE-367CWE-367: Time-of-check Time-of-use (TOCTOU) Race ConditionCWE-639CWE-639: Authorization Bypass Through User-Controlled Key

Affected Products

openproject
opf

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

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

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