# TYPO3-CORE-SA-2026-022: Information Disclosure via Backend Localization Wizard

Advisory record · `PKSA-745m-816f-bzfy`

- **Identifiers:** `PKSA-745m-816f-bzfy` · `CVE-2026-77132`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-200](https://cwe.mitre.org/data/definitions/200.html) · [CWE-862](https://cwe.mitre.org/data/definitions/862.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md) · [Broken access control](https://agentprime.io/advisories/tag/access-control.md)
- **Published:** 8 Sept 2026
- **Updated:** 8 Sept 2026
- **Reviewed by a person:** No

Published by Packagist at 8 Sept 2026, 09:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `typo3/cms-backend` (Packagist): affected `>=10.0.0, <10.4.60 || >=11.0.0, <11.5.54 || >=12.0.0, <12.4.49 || >=13.0.0, <13.4.35 || >=14.0.0, <14.3.7`; fixed in `10.4.60`, `11.5.54`, `12.4.49`, `13.4.35`, `14.3.7`

## 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

- 5.3 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`, from CNA (TYPO3)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0043, the 37th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of Packagist, published 8 Sept 2026. New records show when each source confirmed them.

## Sources

- [OSV: PKSA-745m-816f-bzfy](https://osv.dev/vulnerability/PKSA-745m-816f-bzfy)
- <https://news.typo3.com/security/advisory/typo3-core-sa-2026-022>

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/PKSA-745m-816f-bzfy>, 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/PKSA-745m-816f-bzfy/>. Everything for agents: <https://agentprime.io/llms.txt>.