# Craft CMS Vulnerable to Authenticated RCE via Twig SSTI - create() function + Symfony Process gadget

Advisory record · `GHSA-94rc-cqvm-m4pw`

- **Identifiers:** `GHSA-94rc-cqvm-m4pw` · `CVE-2026-28695` · `PKSA-n7dz-mnbq-y23y`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html) · [CWE-94](https://cwe.mitre.org/data/definitions/94.html) · [CWE-1336](https://cwe.mitre.org/data/definitions/1336.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md) · [Code injection](https://agentprime.io/advisories/tag/code-injection.md)
- **Published:** 3 Mar 2026
- **Updated:** 4 Mar 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 3 Mar 2026, 20:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `craftcms/cms` (Packagist): affected `>=5.8.7, <5.9.0-beta.1 || >=4.0.0-RC1, <4.17.0-beta.1`; fixed in `5.9.0-beta.1`, `4.17.0-beta.1`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Craft CMS (craftcms/cms) versions from 4.0.0-RC1 before 4.17.0-beta.1, and from 5.8.7 before 5.9.0-beta.1, are vulnerable. An authenticated administrator, or a user with access to the System Messages utility, can use a Twig server-side template injection through the create() function, combined with the bundled Symfony Process component, to run arbitrary shell commands on the server. Upgrade to 4.17.0-beta.1 or 5.9.0-beta.1, or later.

Written 3 Nov 2026.

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0066, the 52nd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:26 UTC: First seen by agentprime
- 31 Oct 2026, 14:26 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-94rc-cqvm-m4pw)

## Sources

- [GitHub Advisory Database: GHSA-94rc-cqvm-m4pw](https://github.com/advisories/GHSA-94rc-cqvm-m4pw)
- [OSV: GHSA-94rc-cqvm-m4pw](https://osv.dev/vulnerability/GHSA-94rc-cqvm-m4pw)
- <https://github.com/craftcms/cms/security/advisories/GHSA-94rc-cqvm-m4pw>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-28695>
- <https://github.com/craftcms/cms/commit/e31e50849ad71638e11ea55fbd1ed90ae8f8f6e0>
- <https://github.com/craftcms/cms>

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-94rc-cqvm-m4pw>, 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-94rc-cqvm-m4pw/>. Everything for agents: <https://agentprime.io/llms.txt>.