XSS in Ewww Image Optimizer
CVE-2026-91011
The EWWW Image Optimizer WordPress plugin before 8.7.7 does not properly escape image attribute values when it rewrites page output, allowing authenticated users with author-level access and above to inject arbitrary JavaScript that is stored in published content and executes in the browser of any user who later views the affected page.
Vulnerability class: XSS (Cross-Site Scripting)
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Unknown Ewww Image Optimizer
Weakness classification (CWE)
References
- contact@wpscan.com (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-91011?
- CVE-2026-91011 is a medium-severity vulnerability in Ewww Image Optimizer, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-09-17.
- How severe is CVE-2026-91011?
- Medium severity. CVSS v3 base score is 6.8 out of 10.