Medium severity · published Jun 26, 2026
CVE-2026-44736
OpenProject: Relations API Filter Bypasses Visibility Scope, Leaking Cross-Project Work Package Subjects
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openproject · opf
< 17.4.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44736
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44736
github.com
https://github.com/opf/openproject/security/advisories/GHSA-p9gq-hrgh-2645
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