MEDIUM6.1

GHSA-mcvf-2q2m-x72m

Improper neutralization of data URIs may allow XSS in rails-html-sanitizer

Quick fix

GHSA-mcvf-2q2m-x72m — rails-html-sanitizer: upgrade to the fixed version with the command below.

bundle update rails-html-sanitizer

Details

## Summary

rails-html-sanitizer `>= 1.0.3, < 1.4.4` is vulnerable to cross-site scripting via data URIs when used in combination with Loofah `>= 2.1.0`.

## Mitigation

Upgrade to rails-html-sanitizer `>= 1.4.4`.

## Severity

The maintainers have evaluated this as [Medium Severity 6.1](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

## References

- [CWE - CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (4.9)](https://cwe.mitre.org/data/definitions/79.html) - [SVG MIME Type (image/svg+xml) is misleading to developers · Issue #266 · w3c/svgwg](https://github.com/w3c/svgwg/issues/266) - https://github.com/rails/rails-html-sanitizer/issues/135 - https://hackerone.com/reports/1694173

## Credit

This vulnerability was independently reported by Maciej Piechota (@haqpl) and Mrinmoy Das (@goromlagche).

Are you affected?

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Affected packages

RubyGems/rails-html-sanitizer

Introduced in: 1.0.3Fixed in: 1.4.4

Fixbundle update rails-html-sanitizer