Medium severity · published Jul 30, 2026
CVE-2026-67528
OpenProject: Improper Access Control through /api/v3/custom_options/:id via Path "id" leads to Sensitive Data Exposure
4.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% 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-2026-67528
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-67528
github.com
https://github.com/opf/openproject/commit/a13fa079bc8040449570384c19f2d98f637179f1
github.com
https://github.com/opf/openproject/releases/tag/v17.6.0
github.com
https://github.com/opf/openproject/security/advisories/GHSA-wr3w-qchj-p4cm
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