Vulnerability · Published Jul 30, 2026 · Assigned by GitHub_M

CVE-2026-67528OpenProject: Improper Access Control through /api/v3/custom_options/:id via Path "id" leads to Sensitive Data Exposure

Medium 4.3

In plain English

A medium-severity incorrect 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 30% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.4%top 70.1% 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, GET /api/v3/custom_options/:id resolved CustomOption records by global numeric id and allowed UserCustomField and GroupCustomField options without checking visible(current_user), so authenticated non-admin users could enumerate sequential custom option ids and read labels belonging to admin_only user or group custom fields. This issue is fixed in 17.6.0.

Affected products (as reported)

Vendor	Product	Versions
opf	openproject	< 17.6.0

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/opf/openproject/security/advisories/GHSA-wr3w-qchj-p4cm x_refsource_CONFIRM
https://github.com/opf/openproject/commit/a13fa079bc8040449570384c19f2d98f637179f1 x_refsource_MISC
https://github.com/opf/openproject/releases/tag/v17.6.0 x_refsource_MISC