CVE-2021-39946 - CVE House
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Status published High CVE-2021-39946

Improper neutralization of user input in GitLab CE/EE versions 14.3...

Vulnerability 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

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Thanks jarij for reporting this vulnerability through our HackerOne bug bounty program

References

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CVE-2025-9642
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
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CVE-2025-9484
Missing Authorization in GitLab
Medium 4.3

Affected Vendor

Affected Software

GitLab
Vulnerable Versions:
>=14.3, <14.3.6, >=14.4, <14.4.4, >=14.5, <14.5.2

Timeline

Official Publish: January 18th, 2022
Last Modified: August 4th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.