SB2026042794 - Cross-site scripting in Loofah

Description

This security bulletin contains information about 1 vulnerability.

1) Cross-site scripting (CVE-ID: N/A)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform cross-site scripting.

The vulnerability exists due to improper input validation in Loofah::HTML5::Scrub.allowed_uri? when processing HTML-encoded user-supplied URIs. A remote attacker can supply a specially crafted URI to perform cross-site scripting.

This issue only affects direct callers of the string-level helper with HTML-encoded strings; the default sanitize() path is not affected.

Remediation

Install update from vendor's website.

References

• https://github.com/flavorjones/loofah/security/advisories/GHSA-46fp-8f5p-pf2m