Vulnerability · Published Jul 30, 2026 · Assigned by GitHub_M

CVE-2026-67527OpenProject: Improper Access Control through /api/v3/work_packages/<X.id> via PATCH parameter "fileLinks"

High 7.6

In plain English

A high-severity missing authorization in openproject from opf. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)7.6High

Exploit odds (30 days)0.4%top 62.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
opf	openproject	< 17.6.0

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

References

https://github.com/opf/openproject/security/advisories/GHSA-c6rc-4288-8p4f x_refsource_CONFIRM
https://github.com/opf/openproject/pull/23815 x_refsource_MISC
https://github.com/opf/openproject/commit/db480bdeb8802e3d33e4448bb4e4b56a01de2e1f x_refsource_MISC
https://github.com/opf/openproject/releases/tag/v17.6.0 x_refsource_MISC