# TYPO3-EXT-SA-2026-022: Server-Side Template Injection in extension "powermail" (powermail)

Advisory record · `PKSA-dhfp-j236-nf9h`

- **Identifiers:** `PKSA-dhfp-j236-nf9h` · `CVE-2026-77136`
- **State:** Confirmed
- **Severity:** CVSS 9.5 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-1336](https://cwe.mitre.org/data/definitions/1336.html)
- **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md)
- **Published:** 25 Aug 2026
- **Updated:** 25 Aug 2026
- **Reviewed by a person:** No

Published by Packagist at 25 Aug 2026, 09:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.5: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `in2code/powermail` (Packagist): affected `>=13.0.0, <13.2.1 || >=11.0.0, <12.6.1 || <10.9.3`; fixed in `13.2.1`, `12.6.1`, `10.9.3`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.011, the 65th percentile, on 12 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 25 Aug 2026. New records show when each source confirmed them.

## Sources

- [OSV: PKSA-dhfp-j236-nf9h](https://osv.dev/vulnerability/PKSA-dhfp-j236-nf9h)
- <https://news.typo3.com/security/advisory/typo3-ext-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-dhfp-j236-nf9h>, 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-dhfp-j236-nf9h/>. Everything for agents: <https://agentprime.io/llms.txt>.