CVE-2026-15446: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in nosilver4u EWWW Image Optimizer
The EWWW Image Optimizer WordPress plugin up to version 8.7.3 contains a stored cross-site scripting (XSS) vulnerability via the 'data-script' lazy load attribute in post content. Authenticated users with contributor-level access or higher can inject malicious scripts that execute when other users view the affected pages. This occurs due to insufficient input sanitization and output escaping in handling the 'data-script' attribute combined with the plugin's use of the lazysizes ls.unveilhooks addon.
AI Analysis
Technical Summary
CVE-2026-15446 is a stored cross-site scripting vulnerability in the EWWW Image Optimizer plugin for WordPress, affecting all versions up to and including 8.7.3. The vulnerability arises from improper neutralization of input in the 'data-script' lazy load attribute within post content. Authenticated attackers with contributor-level permissions or higher can embed a crafted img element with class='lazyload' and a malicious 'data-script' attribute URL. The plugin's bundled lazysizes ls.unveilhooks addon dynamically creates and inserts a script element from this attribute into the DOM when the page is viewed, enabling script execution in the context of the site.
Potential Impact
Successful exploitation allows an authenticated contributor or higher to inject arbitrary JavaScript that executes in the browsers of users viewing the compromised post content. This can lead to theft of user credentials, session hijacking, or other malicious actions within the context of the affected WordPress site. The vulnerability does not require user interaction beyond viewing the injected page and does not affect availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict contributor-level access and above to trusted users only. Monitor plugin updates from the vendor for an official fix addressing this vulnerability.
CVE-2026-15446: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in nosilver4u EWWW Image Optimizer
Description
The EWWW Image Optimizer WordPress plugin up to version 8.7.3 contains a stored cross-site scripting (XSS) vulnerability via the 'data-script' lazy load attribute in post content. Authenticated users with contributor-level access or higher can inject malicious scripts that execute when other users view the affected pages. This occurs due to insufficient input sanitization and output escaping in handling the 'data-script' attribute combined with the plugin's use of the lazysizes ls.unveilhooks addon.
CVSS v3.1
Score 6.4medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-15446 is a stored cross-site scripting vulnerability in the EWWW Image Optimizer plugin for WordPress, affecting all versions up to and including 8.7.3. The vulnerability arises from improper neutralization of input in the 'data-script' lazy load attribute within post content. Authenticated attackers with contributor-level permissions or higher can embed a crafted img element with class='lazyload' and a malicious 'data-script' attribute URL. The plugin's bundled lazysizes ls.unveilhooks addon dynamically creates and inserts a script element from this attribute into the DOM when the page is viewed, enabling script execution in the context of the site.
Potential Impact
Successful exploitation allows an authenticated contributor or higher to inject arbitrary JavaScript that executes in the browsers of users viewing the compromised post content. This can lead to theft of user credentials, session hijacking, or other malicious actions within the context of the affected WordPress site. The vulnerability does not require user interaction beyond viewing the injected page and does not affect availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict contributor-level access and above to trusted users only. Monitor plugin updates from the vendor for an official fix addressing this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-07-10T19:15:03.406Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a855220c6e8be03324d4ed4
Added to database: 08/19/2026, 06:50:08 UTC
Last enriched: 08/19/2026, 07:10:29 UTC
Last updated: 08/19/2026, 07:10:29 UTC
Views: 4
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