EWWW Image Optimizer <= 8.7.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'data-script' Lazy Load Attribute in Post Content

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-15446
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-19 07:16:27 UTC
Updated2026-08-19 07:16:27 UTC
DescriptionThe EWWW Image Optimizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'data-script' Lazy Load Attribute in Post Content in all versions up to, and including, 8.7.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit is achieved by embedding a crafted img element with class='lazyload' and a data-script attribute pointing to an attacker-controlled URL in post content, which the plugin's bundled lazysizes ls.unveilhooks addon then uses to dynamically create and insert a script element into the DOM at page view time.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nosilver4u EWWW Image Optimizer affected 8.7.3 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/classes/class-lazy-lo... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/includes/ls.unveilhoo... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/includes/ls.unveilhoo... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/includes/ls.unveilhoo... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/includes/ls.unveilhoo... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.6.0/classes/class-lazy-lo... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/classes/class-lazy-lo... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/ewww-image-optimizer/tags/8.7.3/classes/class-lazy-lo... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/e8af1fdb-7fec-4bbe-937b-ee2e7... [email protected] www.wordfence.com
github.com/nosilver4u/ewww-image-optimizer/commit/4488aafaee9212db370a5e... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: UKO (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-10T20:26:32.000ZVendor Notified
CNA2026-08-18T17:52:25.000ZDisclosed

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