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CVE-2026-91049

MEDIUM 6.4 CVSS 3.1
Published
November 5, 2026
Last modified
November 6, 2026
NVD status
Deferred
Reported by
contact@wpscan.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H

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.

Affected WordPress components

  • EWWW Image Optimizer Plugin · ewww-image-optimizer
    Confirmed match Active
    From 8.7.4 (including) to 8.9.1 (excluding)
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • Unknown EWWW Image Optimizer — From 8.7.4 (including) to 8.9.1 (excluding)

References

  • wpscan.com https://wpscan.com/vulnerability/cdaf3779-3e8a-4997-9868-707bcc06f9a7/
  • nvd.nist.gov Official NVD record