The 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.
History

Fri, 21 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Fri, 21 Aug 2026 13:00:00 +0000

Type Values Removed Values Added
First Time appeared Nosilver4u
Nosilver4u ewww Image Optimizer
Wordpress
Wordpress wordpress
Vendors & Products Nosilver4u
Nosilver4u ewww Image Optimizer
Wordpress
Wordpress wordpress

Wed, 19 Aug 2026 07:00:00 +0000

Type Values Removed Values Added
Description The 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.
Title EWWW Image Optimizer <= 8.7.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'data-script' Lazy Load Attribute in Post Content
Weaknesses CWE-79
References
Metrics cvssV3_1

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


cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published: 2026-08-19T06:37:54.690Z

Updated: 2026-08-20T15:26:35.613Z

Reserved: 2026-07-10T19:15:03.406Z

Link: CVE-2026-15446

cve-icon Vulnrichment

Updated: 2026-08-20T15:26:21.481Z

cve-icon NVD

Status : Deferred

Published: 2026-08-19T07:16:27.530

Modified: 2026-08-20T16:17:08.427

Link: CVE-2026-15446

cve-icon Redhat

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