CVE-2026-91049

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

Published Nov 5, 2026 CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Weaknesses CWE-79
Type Values Removed Values Added
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.
Title EWWW Image Optimizer 8.7.4 - 8.9.0 - Author+ Stored XSS via 'data-script' Lazy Load Attribute
References

Subscriptions

No data.

Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Nov 6, 2026, 12:02 PM
Reserved
Sep 14, 2026, 5:15 PM
Status
Deferred
Published
Nov 5, 2026, 6:17 AM
Modified
Nov 6, 2026, 1:17 PM