What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-10-23
• Weakness: CWE-863

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

• opf openproject: before 17.6.0

References

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

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