What is CVE-2020-13343?

CVE-2020-13343 is a high-severity vulnerability in GitLab, classified under Exposure of Resource to Wrong Sphere. CVSS score: 7.5/10. Published 2020-10-06.

How severe is CVE-2020-13343?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in GitLab

CVE-2020-13343

An issue has been discovered in GitLab affecting all versions starting from 11.2. Unauthorized Users Can View Custom Project Template

Published 2020-10-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

GitLab — versions >=11.2, <13.2.10, >=13.3.0, <13.3.7, >=13.4.0, <13.4.2

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

gitlab.com/gitlab-org/gitlab/-/issues/14861 (Broken Link)
hackerone.com/reports/689314 (Exploit, Third Party Advisory)
gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13343.json (Third Party Advisory)

Frequently asked questions

What is CVE-2020-13343?: CVE-2020-13343 is a high-severity vulnerability in GitLab, classified under Exposure of Resource to Wrong Sphere. CVSS score: 7.5/10. Published 2020-10-06.
How severe is CVE-2020-13343?: High severity. CVSS v3 base score is 7.5 out of 10.