CVE-2021-39946

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-01-18 · updated 2026-06-17
Weakness: CWE-79

Description

Improper neutralization of user input in GitLab CE/EE versions 14.3 to 14.3.6, 14.4 to 14.4.4, and 14.5 to 14.5.2 allowed an attacker to exploit XSS by abusing the generation of the HTML code related to emojis

Affected products

GitLab: from 14.3 before 14.3.6; from 14.4 before 14.4.4; from 14.5 before 14.5.2 — fixed in 14.3.6, 14.4.4, 14.5.2

How to fix

Upgrade to a fixed version: GitLab 14.3.6, 14.4.4, 14.5.2. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39946.json
https://gitlab.com/gitlab-org/gitlab/-/issues/345657
https://hackerone.com/reports/1398305
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39946.json
https://gitlab.com/gitlab-org/gitlab/-/issues/345657
https://hackerone.com/reports/1398305

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