CVE-2023-23627

MEDIUM

sanitize 5.0.0-6.0.0 - Cross-Site Scripting via Custom Allowlist with noscript Elements

Title source: llm
STIX 2.1

Description

Sanitize is an allowlist-based HTML and CSS sanitizer. Versions 5.0.0 and later, prior to 6.0.1, are vulnerable to Cross-site Scripting. When Sanitize is configured with a custom allowlist that allows `noscript` elements, attackers are able to include arbitrary HTML, resulting in XSS (cross-site scripting) or other undesired behavior when that HTML is rendered in a browser. The default configurations do not allow `noscript` elements and are not vulnerable. This issue only affects users who are using a custom config that adds `noscript` to the element allowlist. This issue has been patched in version 6.0.1. Users who are unable to upgrade can prevent this issue by using one of Sanitize's default configs or by ensuring that their custom config does not include `noscript` in the element allowlist.

References (1)

Core 1
Core References
Mitigation, Release Notes, Third Party Advisory x_refsource_confirm
https://github.com/rgrove/sanitize/security/advisories/GHSA-fw3g-2h3j-qmm7

Scores

CVSS v3 6.1
EPSS 0.0044
EPSS Percentile 63.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
rubygems/sanitize 5.0.0 - 6.0.1RubyGems
sanitize_project/sanitize 5.0.0 - 6.0.1
Published Jan 28, 2023
Tracked Since Feb 18, 2026