# Duplicate Advisory: TYPO3-CORE-SA-2026-021: Broken Access Control in Backend and Install Tool

Advisory record · `GHSA-4f2f-jr2m-j7p4` · Withdrawn

- **Identifiers:** `GHSA-4f2f-jr2m-j7p4`
- **State:** Withdrawn
- **Severity:** CVSS 4.0, no score published
- **Critical:** No
- **Weakness (CWE):** [CWE-346](https://cwe.mitre.org/data/definitions/346.html)
- **Tags:** [CWE-346](https://agentprime.io/advisories/tag/cwe-346.md)
- **Published:** 11 Aug 2026
- **Updated:** 1 Sept 2026
- **Reviewed by a person:** No

**Withdrawn.** The GitHub Advisory Database withdrew this advisory on 1 Sept 2026. The record stays here, marked withdrawn.

Published by the GitHub Advisory Database at 11 Aug 2026, 09:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `typo3/cms-core` (Packagist): affected `>=13.0.0, <13.4.34 || >=14.0.0, <14.3.6`; fixed in `13.4.34`, `14.3.6`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- Score not published, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## Timeline

- 31 Oct 2026, 14:06 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-4f2f-jr2m-j7p4)

## Sources

- [GitHub Advisory Database: GHSA-4f2f-jr2m-j7p4](https://github.com/advisories/GHSA-4f2f-jr2m-j7p4)
- [OSV: GHSA-4f2f-jr2m-j7p4](https://osv.dev/vulnerability/GHSA-4f2f-jr2m-j7p4)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-19418>
- <https://github.com/TYPO3/typo3/commit/4a75e862c589c85d795d7c65dcdc835f8f413efc>
- <https://github.com/TYPO3/typo3/commit/a0e8ee06a40e959b9e7b06a4b1cb19d3a0d3dcf7>
- <https://github.com/TYPO3/typo3/commit/ae0abd329d52285fe6e92804c3608820ad45e872>
- <https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2026-19418.yaml>
- <https://news.typo3.com/security/advisory/typo3-core-sa-2026-021>
- <https://typo3.org/security/advisory/typo3-core-sa-2020-006>
- <https://typo3.org/security/advisory/typo3-core-sa-2026-021>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-4f2f-jr2m-j7p4>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-4f2f-jr2m-j7p4/>. Everything for agents: <https://agentprime.io/llms.txt>.