Cross-site scripting in Loofah - CVE-2026-73492
Published: November 6, 2026
Vulnerability identifier: #VU159819
CSH Severity: Medium
CVSS v4: 5.1 [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]
CVE-ID: CVE-2026-73492
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to execute JavaScript in a victim's browser through cross-site scripting.
The vulnerability exists due to incomplete decoding of numeric character references without trailing semicolons in Loofah's allowed_uri? helper when applications validate HTML-encoded URLs. An unauthenticated remote attacker can submit an encoded malicious URL that passes validation and executes when rendered in a URI attribute and activated by the victim.
Affected software
Loofah
How to mitigate CVE-2026-73492
Install security update from vendor's website.
Loofah - update to 2.25.2