What is CVE-2026-5173?

CVE-2026-5173 is a high-severity vulnerability in Gitlab, classified under CWE-749. CVSS score: 8.5/10. Published 2026-04-08.

How severe is CVE-2026-5173?

High severity. CVSS v3 base score is 8.5 out of 10.

Is CVE-2026-5173 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Gitlab

CVE-2026-5173

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9.6 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that could have allowed an authenticated user to invoke unintended server-side methods through we…

EPSS: 0.000 (7.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

Affected products

Gitlab — versions 16.9.6, 18.9, 18.10

Weakness classification (CWE)

CWE-749

Public proof-of-concept exploits

0xBlackash/CVE-2026-5173

References

Frequently asked questions

What is CVE-2026-5173?: CVE-2026-5173 is a high-severity vulnerability in Gitlab, classified under CWE-749. CVSS score: 8.5/10. Published 2026-04-08.
How severe is CVE-2026-5173?: High severity. CVSS v3 base score is 8.5 out of 10.
Is CVE-2026-5173 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.