6.4
Medium
CVE-2026-91049 EWWW Image Optimizer 8.7.4 - 8.9.0 - Author+ Stored XSS via 'data-script' Lazy Load Attribute
Description
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.
CVSS 3.1 detail
Vector CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:HExploitable remotely over the network, with an administrator account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- High
- Interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| EWWW Image Optimizer 8.7 | 8.7.4 → < 8.9.1 | 8.9.1 |
Other CVEs of EWWW Image Optimizer
The 4 CVEs of EWWW Image Optimizer →
CVE-2026-91072
The EWWW Image Optimizer WordPress plugin before 8.8.0 does not confine a WebP-derivative file migration routine to…
4.4
Medium
CVE-2026-91051
The EWWW Image Optimizer WordPress plugin before 8.8.0 does not prevent authenticated users with author-level…
6.6
Medium
CVE-2026-91011
The EWWW Image Optimizer WordPress plugin before 8.7.7 does not properly escape image attribute values when it…
6.8
Medium