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CVE-2026-91049 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:8.7 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CNA: CISA-ADPCVSS-B:6.4 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://wpscan.com/vulnerability/cdaf3779-3e8a-4997-9868-707bcc06f9a7/	[email protected]	AdvisoryExploitRemedy

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	CISA-ADP

Affected Products

Product	Versions
EWWW Image Optimizer	>= 8.7.4, <= 8.9.0 (semver)
CPE cpe:2.3:a:ewww:image_optimizer::::::wordpress::* Remediation Upgrade: 8.9.1moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 6, 2026	CVE Modified	CISA-ADP
Nov 5, 2026	New CVE Received	[email protected]