What is CVE-2018-8971?

CVE-2018-8971 is a critical-severity vulnerability in GitLab, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2018-03-24.

How severe is CVE-2018-8971?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in GitLab

CVE-2018-8971

The Auth0 integration in GitLab before 10.3.9, 10.4.x before 10.4.6, and 10.5.x before 10.5.6 has an incorrect omniauth-auth0 configuration, leading to signing in unintended users.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-03-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.2th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

GitLab
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

about.gitlab.com/2018/03/20/critical-security-release-gitlab-10-dot-5-dot-6-rel… (Vendor Advisory)
www.debian.org/security/2018/dsa-4206 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2018-8971?: CVE-2018-8971 is a critical-severity vulnerability in GitLab, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2018-03-24.
How severe is CVE-2018-8971?: Critical severity. CVSS v3 base score is 9.8 out of 10.