CVE-2021-39885

Name: CVE-2021-39885
Creator: NVD / NIST
Published: 2021-10-04T17:15:08.247+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.95%

Last modified Jun 17, 2026

CVE-2021-39885 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. A Stored XSS in merge request creation page in all versions of Gitlab EE starting from 13.7 before 14.1.7, all versions starting from 14.2 before 14.2.5, and all versions starting from 14.3 before 14.3.1 allows an attacker to execute arbitrary JavaScript code on the victim's behalf via malicious approval rule names. EPSS estimates a 0.95% chance of exploitation in the next 30 days.

Description

A Stored XSS in merge request creation page in all versions of Gitlab EE starting from 13.7 before 14.1.7, all versions starting from 14.2 before 14.2.5, and all versions starting from 14.3 before 14.3.1 allows an attacker to execute arbitrary JavaScript code on the victim's behalf via malicious approval rule names

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.95%

56.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	>= 13.7.0, < 14.1.7
Gitlab	Gitlab	>= 14.2.0, < 14.2.5
Gitlab	Gitlab	14.3.0

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39885.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/341140Exploit, Issue Tracking, Vendor Advisory
https://hackerone.com/reports/1342009Exploit, Permissions Required, Third Party Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39885.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/341140Exploit, Issue Tracking, Vendor Advisory
https://hackerone.com/reports/1342009Exploit, Permissions Required, Third Party Advisory

Timeline

Published: Oct 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39885?

How severe is CVE-2021-39885?

CVE-2021-39885 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39885?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39885?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST