# Concrete CMS vulnerable to Cross-Site Request Forgery (CSRF)

Advisory record · `GHSA-6mxw-2vhf-42g5`

- **Identifiers:** `GHSA-6mxw-2vhf-42g5` · `CVE-2026-2994` · `PKSA-46yc-bd63-xkv6`
- **State:** Confirmed
- **Severity:** CVSS 2.3 Low
- **Critical:** No
- **Weakness (CWE):** [CWE-352](https://cwe.mitre.org/data/definitions/352.html)
- **Tags:** [Cross-site request forgery (CSRF)](https://agentprime.io/advisories/tag/csrf.md)
- **Published:** 4 Mar 2026
- **Updated:** 4 Mar 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 4 Mar 2026, 03:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `concrete5/concrete5` (Packagist): affected `<9.4.8`; fixed in `9.4.8`

## Machine-written summary

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

> Concrete CMS (concrete5/concrete5) versions below 9.4.8 are vulnerable to cross-site request forgery in the Anti-Spam Allowlist group configuration, where changes are saved before the CSRF token is checked. An attacker who is a rogue administrator can use this to bypass security protections. Upgrade to version 9.4.8 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

- 2.3 Low, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`, from CNA (ConcreteCMS)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0024, the 14th 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-6mxw-2vhf-42g5)

## Sources

- [GitHub Advisory Database: GHSA-6mxw-2vhf-42g5](https://github.com/advisories/GHSA-6mxw-2vhf-42g5)
- [OSV: GHSA-6mxw-2vhf-42g5](https://osv.dev/vulnerability/GHSA-6mxw-2vhf-42g5)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-2994>
- <https://github.com/concretecms/concretecms/pull/12826>
- <https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes>
- <https://github.com/concretecms/concretecms>

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-6mxw-2vhf-42g5>, 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-6mxw-2vhf-42g5/>. Everything for agents: <https://agentprime.io/llms.txt>.