Improper neutralization of data URIs may allow XSS in rails-html-sanitizer
## 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).
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2022-23518US | medium6.1 | — | ||
rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Versions >= 1.0.3, < 1.4.4 are vulnerable to cross-site scripting via data URIs when used i… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/rails/rails-html-sanitizerPACKAGE
- https://github.com/rails/rails-html-sanitizer/issues/135WEB
- https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-mcvf-2q2m-x72mWEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rails-html-sanitizer/CVE-2022-23518.ymlWEB
- https://github.com/w3c/svgwg/issues/266WEB
- https://hackerone.com/reports/1694173WEB
- https://lists.debian.org/debian-lts-announce/2023/09/msg00012.htmlWEB
- https://lists.debian.org/debian-lts-announce/2024/09/msg00045.htmlWEB
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