What is CVE-2018-18640?

CVE-2018-18640 is a medium-severity vulnerability in GitLab, classified under Information Disclosure. CVSS score: 6.5/10. Published 2018-12-04.

How severe is CVE-2018-18640?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Information disclosure in GitLab

CVE-2018-18640

An issue was discovered in GitLab Community and Enterprise Edition before 11.2.7, 11.3.x before 11.3.8, and 11.4.x before 11.4.3. It has Information Exposure Through Browser Caching.

Vulnerability class: Information Disclosure

Published 2018-12-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (65.9th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

GitLab

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

gitlab.com/gitlab-org/gitlab-ce/issues/51423 (Exploit, Issue Tracking, Vendor Advisory)
about.gitlab.com/2018/10/29/security-release-gitlab-11-dot-4-dot-3-released/ (Vendor Advisory)

Frequently asked questions

What is CVE-2018-18640?: CVE-2018-18640 is a medium-severity vulnerability in GitLab, classified under Information Disclosure. CVSS score: 6.5/10. Published 2018-12-04.
How severe is CVE-2018-18640?: Medium severity. CVSS v3 base score is 6.5 out of 10.