CVE-2021-39946

Improper neutralization of user input in GitLab CE/EE versions 14.3 to 14.3.6, 14.4 to 14.4.4,...

8.7 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: None

Exploit likelihood

1.04%Up 0.2 points since Jan 19, 2022

What each source reports

CVE List Score used 8.7

Record: CVE-2021-39946
CVSS 3.1: 8.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Updated: 2026-11-02

EUVDEUVD-2021-26302 8.7

Record: EUVD-2021-26302
CVSS 3.1: 8.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-rvcw-fpwr-r263 No score

Improper neutralization of user input in GitLab CE/EE versions 14.3 to 14.3.6, 14.4 to 14.4.4,...

Record: GHSA-rvcw-fpwr-r263
Weakness: CWE-79
Updated: 2026-11-02

NVD 8.7

Record: CVE-2021-39946
CVSS 3.1: 8.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 5.4

Record: CVE-2021-39946
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-39946 5.4

Record: UBUNTU-CVE-2021-39946
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 3.1: 8.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Updated: 2026-11-02

OSVBIT-gitlab-2021-39946 No score

Record: BIT-gitlab-2021-39946
Updated: 2026-11-02

Affected products

gitlab

Affected packages

Affected packages
Package	Affected	Fixed
`gitlab` Bitnami	14.3.0 up to 14.3.6, 14.4.0 up to 14.4.4, 14.5.0 up to 14.5.2	14.3.614.4.414.5.2
`gitlab` Ubuntu:16.04:LTS	All versions, plus listed versions 8.4.3+dfsg-98.4.3+dfsg-128.5.8+dfsg-5	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-39946 is a high vulnerability (CVSS 8.7) in Gitlab, published January 18, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.04%, the 64th percentile. Fixed in gitlab 14.3.6.