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CVE-2026-6427— a3 Lazy Load <= 2.7.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via Video Element

CVSS 6.4 · Medium EPSS 0.29% · P22

Affected Version Matrix 1

VendorProductVersion RangeStatus
a3reva3 Lazy Load≤ 2.7.6affected
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I. Basic Information for CVE-2026-6427

Vulnerability Information
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Vulnerability Title
a3 Lazy Load <= 2.7.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via Video Element
Source: CVE Program / CVE List V5
Vulnerability Description
The a3 Lazy Load plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.7.6 This is due to a regex bug in the _filter_videos() method that breaks HTML attribute quoting when processing crafted <video> elements, combined with unescaped output in the admin/views/form-data.php template. An authenticated attacker with Contributor-level access can insert a crafted <video> tag whose src attribute contains an embedded class=" substring that tricks the plugin's class-replacement regex into consuming an attribute-value closing quote. This shifts the HTML5 parser's quote boundary, promoting attacker-controlled text from inside a quoted attribute value into standalone event-handler attributes (autofocus, onfocus). The injected script executes in the browser of any user (including administrators) who views the post.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin a3 Lazy Load 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin a3 Lazy Load 2.7.6及之前版本存在跨站脚本漏洞，该漏洞源于_filter_videos方法中正则表达式错误导致HTML属性引用中断，可能导致存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
a3reva3 Lazy Load 0 ~ 2.7.6 -

II. Public POCs for CVE-2026-6427

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III. Intelligence Information for CVE-2026-6427

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Patches & Fixes for CVE-2026-6427 (6)

News Coverage for CVE-2026-6427 (1)

Other References for CVE-2026-6427 (1)

IV. Related Vulnerabilities

Same product: a3 Lazy Load
Same vendor: a3rev
Same weakness: CWE-79

V. Comments for CVE-2026-6427

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