CVE-2026-44736

OpenProject: Relations API Filter Bypasses Visibility Scope, Leaking Cross-Project Work Package Subjects

State: Published
Severity: 6.5 Medium
Published: Jun 26, 2026
Updated: Jun 27, 2026
Reserved: May 7, 2026

Description

OpenProject is open-source, web-based project management software. Prior to 17.4.0, the GET /api/v3/relations endpoint allows any authenticated user to retrieve relations — and the subject (title) of work packages they have no permission to view — by supplying an arbitrary work package ID in the involved, fromId, or toId filter. This bypasses the Relation.visible scope due to a flawed performance optimization in RelationQuery. This vulnerability is fixed in 17.4.0.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-639 Authorization Bypass Through User-Controlled Key
CWE-836 Use of Password Hash Instead of Password for Authentication

Affected Products

Product	Versions
openprojectopf	< 17.4.0Affected

References

https://github.com/opf/openproject/security/advisories/GHSA-p9gq-hrgh-2645

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