CVE-2026-91011Wordfence

Vulnerability Summary

The EWWW Image Optimizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 8.7.6. This is due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Severity Level

MEDIUM(6.4)

Published Date

Sep 17, 2026

Last Modified

Sep 22, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.24%Probability

Root Weakness (CWE)

CWE-79: Cross-site Scripting (XSS) ↗

The software does not neutralize user-controllable input before it is placed in output that is used as a web page.

CVSS v3.1 Base Metrics — Score 6.4 (MEDIUM)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

ConfidentialityLow

IntegrityLow

AvailabilityNone

Affected & Patched Versions

Affected Versions

EWWW Image Optimizer * - 8.7.6

Patched Versions

EWWW Image Optimizer 1

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