What is CVE-2026-67528?

CVE-2026-67528 is a medium-severity vulnerability in Opf Openproject, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-07-30.

How severe is CVE-2026-67528?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Opf Openproject

CVE-2026-67528

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…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Opf Openproject — versions < 17.6.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-67528?: CVE-2026-67528 is a medium-severity vulnerability in Opf Openproject, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-07-30.
How severe is CVE-2026-67528?: Medium severity. CVSS v3 base score is 4.3 out of 10.