Vulnerability · Published Jun 26, 2026 · Assigned by GitHub_M

CVE-2026-44736OpenProject: Relations API Filter Bypasses Visibility Scope, Leaking Cross-Project Work Package Subjects

Medium 6.5

In plain English

A medium-severity information exposure in openproject from opf. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 70.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
opf	openproject	< 17.4.0

Weakness: CWE-200, CWE-639, CWE-836 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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