CVE-2026-91049

CVE-2026-91049: vulnerability in EWWW Image Optimizer

EWWW Image Optimizer 8.7.4 - 8.9.0 - Author+ Stored XSS via 'data-script' Lazy Load Attribute

Published

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23Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendepss 0.2%
The EWWW Image Optimizer WordPress plugin before 8.9.1 does not properly sanitize and restrict a value in post content before using it to dynamically load and execute a script in the page, allowing authenticated attackers with author-level access and above to inject arbitrary web scripts that run in the session of any user who views the affected page, including administrators. This is an incomplete fix of CVE-2026-15446: the origin and path restrictions added from 8.7.4 onward were each bypassable, so versions 8.7.4 through 8.9.0 remain affected.
Affected products
Unknown · EWWW Image Optimizer
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — EWWW Image Optimizer

In the same product, most dangerous first.

CVE-2026-91011MEDIUMEWWW Image Optimizer < 8.7.7 - Author+ Stored XSS via Image Class Attribute Backreference ExpansionEPSS 0.4%CVE-2026-91051MEDIUMEWWW Image Optimizer 8.6.0 - 8.7.7 - Author+ PHP Object Injection via 'eio_page_settings' Post MetaEPSS 0.3%CVE-2026-91072MEDIUMEWWW Image Optimizer < 8.8.0 - Admin+ WebP File Rename and Deletion via Unrestricted Path in WebP Migration HandlerEPSS 0.2%