XSS in Litespeed Cache
CVE-2026-113500
The LiteSpeed Cache WordPress plugin before 7.9.2 does not limit one of its HTML optimization routines to stylesheet content, so it can delete the markup that closes an attribute in the rendered page, and combined with unescaped comment author output this allows unauthenticated users whose comments are published to inject event-handler attributes that run JavaScript in the browser of any visitor, including a logged-in administrator, viewing front-end pages while the optimization is enabled.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Litespeed Cache
Weakness classification (CWE)
References
- wpscan.com/vulnerability/f841e09f-275c-4c10-a5b7-af294f92db29/ (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-113500?
- CVE-2026-113500 is a high-severity vulnerability in Litespeed Cache, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2026-10-23.
- How severe is CVE-2026-113500?
- High severity. CVSS v3 base score is 7.5 out of 10.