CVE-2026-91072: Unknown Ewww Image Optimizer

Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The EWWW Image Optimizer WordPress plugin before 8.8.0 does not confine a WebP-derivative file migration routine to the current site's own uploads directory, letting an attacker with Administrator-level access rename or delete existing WebP-derivative image files outside that scope, including, on a multisite network, files belonging to a different site they have no access to.

Affected products

• Unknown Ewww Image Optimizer: before 8.8.0 (fixed in 8.8.0)

Published 2026-09-30. Last modified 2026-09-30.