High severity · published Jul 30, 2026
CVE-2026-67527
OpenProject: Improper Access Control through /api/v3/work_packages/<X.id> via PATCH parameter "fileLinks"
7.6
CVSS
0.4%
EPSS
No
On KEV
Description
OpenProject is open-source, web-based project management software. Prior to 17.6.0, PATCH /api/v3/work_packages/{id} accepted _links.fileLinks and allowed authenticated users with edit_work_packages but without manage_file_links to resolve Storages::FileLink records by raw id, detach or hard-delete existing FileLinks, and re-parent FileLinks from other projects to an attacker-controlled work package, exposing origin filename, origin id, and MIME type metadata. This issue is fixed in 17.6.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openproject · opf
< 17.6.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-67527
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-67527
github.com
https://github.com/opf/openproject/commit/db480bdeb8802e3d33e4448bb4e4b56a01de2e1f
github.com
https://github.com/opf/openproject/pull/23815
github.com
https://github.com/opf/openproject/releases/tag/v17.6.0
github.com
https://github.com/opf/openproject/security/advisories/GHSA-c6rc-4288-8p4f
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