No exploitation reportedFix available

CVE-2020-13356

Q: Is CVE-2020-13356 actively exploited?

Active exploitation of CVE-2020-13356 has not been confirmed. Its EPSS score was 1.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-13356?

CVE-2020-13356 has a CVSS v3 base score of 8.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

No exploitation reported by the sources we read.

Published2020-11-19
Fixed in13.5.2 · 13.4.5 · 13.3.9

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 8.8.9. A specially crafted request could bypass Multipart protection and read files in certain specific paths on the server. Affected versions are: >=8.8.9, <13.3.9,>=13.4, <13.4.5,>=13.5, <13.5.2.

Timeline

dates in UTC

2020-11-1900:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-13356?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-13356?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

GitLab

Branch	Affected	Fixed in	Source
13.5	≥ 13.5.0, < 13.5.2	13.5.2	NVD
13.4	≥ 13.4.0, < 13.4.5	13.4.5	NVD
13.3	≥ 8.8.9, < 13.3.9	13.3.9	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update GitLab to 13.5.2 · 13.4.5 · 13.3.9

Advisories and patches

gitlab.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.18.2read 2026-10-23
NVDCVSS 3.18.2read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
FIRST EPSSEPSS score1.8 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Published: 2020-11-19
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-13356?

Is CVE-2020-13356 actively exploited?

Active exploitation of CVE-2020-13356 has not been confirmed. Its EPSS score was 1.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-13356?

CVE-2020-13356 has a CVSS v3 base score of 8.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

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