# Craft CMS: Authenticated RCE through Twig sandbox escape

Advisory record · `GHSA-f5wm-88jv-g5hx`

- **Identifiers:** `GHSA-f5wm-88jv-g5hx` · `CVE-2026-72781` · `PKSA-d48x-nyby-nphv`
- **State:** Confirmed
- **Severity:** CVSS 8.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-693](https://cwe.mitre.org/data/definitions/693.html)
- **Tags:** [CWE-693](https://agentprime.io/advisories/tag/cwe-693.md)
- **Published:** 6 Aug 2026
- **Updated:** 1 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 6 Aug 2026, 21:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `craftcms/cms` (Packagist): affected `>=5.0.0-RC1, <5.10.7 || >=4.0.0-RC1, <4.18.3`; fixed in `5.10.7`, `4.18.3`

## Machine-written summary

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

> Craft CMS versions from 4.0.0-RC1 before 4.18.3 and from 5.0.0-RC1 before 5.10.7 are affected by a Twig sandbox escape. The sandbox's allowlisting lets templates reach a dangerous function-call gadget inherited from the Yii framework's base component class. An attacker with control panel access who can render a malicious Twig template can achieve remote code execution, even with the Twig sandbox enabled. Upgrade to Craft CMS 4.18.3 or 5.10.7, which contain fixes.

Written 31 Oct 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0079, the 56th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:06 UTC: First seen by agentprime
- 31 Oct 2026, 14:06 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-f5wm-88jv-g5hx)

## Sources

- [GitHub Advisory Database: GHSA-f5wm-88jv-g5hx](https://github.com/advisories/GHSA-f5wm-88jv-g5hx)
- [OSV: GHSA-f5wm-88jv-g5hx](https://osv.dev/vulnerability/GHSA-f5wm-88jv-g5hx)
- <https://github.com/craftcms/cms/security/advisories/GHSA-f5wm-88jv-g5hx>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-72781>
- <https://github.com/craftcms/cms/commit/0b8be1556be4e030578ec779c3e17ffe2e69d7db>
- <https://github.com/craftcms/cms>
- <https://github.com/craftcms/cms/releases/tag/4.18.3>
- <https://github.com/craftcms/cms/releases/tag/5.10.7>
- <https://www.vulncheck.com/advisories/craft-cms-rc1-before-remote-code-execution-via-twig-sandbox-escape>

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-f5wm-88jv-g5hx>, 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-f5wm-88jv-g5hx/>. Everything for agents: <https://agentprime.io/llms.txt>.