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CVE-2026-109234— Meow Lightbox <= 5.6.4 - Unauthenticated Stored Cross-Site Scripting via HTML Parser Quote-Metadata Desynchronization

Quick assessment

Affected
tigroumeow Meow Lightbox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Meow Lightbox 插件在所有 5.6.4 及以下版本中存在存储型跨站脚本（Stored XSS）漏洞。该漏洞源于对 （bbPress 回复正文）参数的输入过滤和输出转义不足。这使得未认证的攻击者能够在页面中注入任意 Web 脚本；当任何用户访问被注入的页面时，这些脚本将自动执行。 触发该漏洞需满足以下前置条件： 管理员已启用输出缓冲（Output Buffering）； 启用了 HtmlDomParser 引擎； 启用了“激进解析”（Aggressive Resolve）； 存在存

CVSS 7.2 · High
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I. Basic Information for CVE-2026-109234

Vulnerability Information
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Vulnerability Title
Meow Lightbox <= 5.6.4 - Unauthenticated Stored Cross-Site Scripting via HTML Parser Quote-Metadata Desynchronization
Source: CVE Program / CVE List V5
Vulnerability Description
The Meow Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'post_content (bbPress reply body)' parameter in all versions up to, and including, 5.6.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the administrator to have enabled Output Buffering, the HtmlDomParser engine, and Aggressive Resolve, as well as a stored-HTML submission surface (such as bbPress anonymous replies) whose kses allow-list preserves img attributes; given these preconditions, a one-shot unauthenticated submission can execute arbitrary JavaScript in the context of any user who views the affected page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
tigroumeow Meow Lightbox 0 ~ 5.6.4 -

II. Public POCs for CVE-2026-109234

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III. Intelligence Information for CVE-2026-109234

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Other References for CVE-2026-109234 (7)

IV. Related Vulnerabilities

Same product: Meow Lightbox
Same vendor: tigroumeow
Same weakness: CWE-79