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

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Summary

CVECVE-2026-40896
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-20 16:16:48 UTC
Updated2026-04-20 19:03:07 UTC
DescriptionOpenProject 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.000240000 probability, percentile 0.065530000 (date 2026-04-21)

Problem Types: CWE-367 | CWE-639 | CWE-367 CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Opf Openproject affected < 17.3.0 Not specified

References

ReferenceSourceLinkTags
github.com/opf/openproject/security/advisories/GHSA-hh5p-gwf8-h245 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/opf/openproject/commit/8f693a1f35d0a84bb69af78fb6925f74329ae4fe [email protected] github.com
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