What is CVE-2020-13336?

CVE-2020-13336 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 4.0/10. Published 2020-09-30.

How severe is CVE-2020-13336?

Medium severity. CVSS v3 base score is 4.0 out of 10.

XSS in GitLab

CVE-2020-13336

An issue has been discovered in GitLab affecting versions from 11.8 before 12.10.13. GitLab was vulnerable to a stored XSS by in the error tracking feature.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-09-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (41.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

GitLab — versions >=11.8, <12.10.13

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

gitlab.com/gitlab-org/gitlab/-/issues/215970 (Exploit, Issue Tracking, Vendor Advisory)
gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13336.json (Vendor Advisory)

Frequently asked questions

What is CVE-2020-13336?: CVE-2020-13336 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 4.0/10. Published 2020-09-30.
How severe is CVE-2020-13336?: Medium severity. CVSS v3 base score is 4.0 out of 10.