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CVE-2026-9239— Meow Gallery <= 5.5.1 - Authenticated (Author+) Stored Cross-Site Scripting via Attachment Alt Text (aria-label attribute)

Quick assessment

Affected
tigroumeow Meow Gallery
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 Gallery 插件在所有 5.5.1 及以下版本中存在存储型跨站脚本（Stored XSS）漏洞。该漏洞源于对附件替代文本（即 属性）的输入过滤和输出转义不足。拥有作者（Author）级别或更高权限的已认证攻击者，可利用此漏洞在页面中注入任意 Web 脚本；当用户访问被注入的页面时，这些脚本将自动执行。 该漏洞的攻击路径仅在画廊项被渲染为链接时（即 非空）才可触发。其利用原理依赖于 WordPress 的 函数：该函数会移除尖括号包裹的标签，但会保留双引号。攻击者可借此跳出 属性

CVSS 6.4 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
tigroumeow Meow Gallery ≤ 5.5.1 affected
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I. Basic Information for CVE-2026-9239

Vulnerability Information
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Vulnerability Title
Meow Gallery <= 5.5.1 - Authenticated (Author+) Stored Cross-Site Scripting via Attachment Alt Text (aria-label attribute)
Source: CVE Program / CVE List V5
Vulnerability Description
The Meow Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Attachment Alt Text (aria-label attribute) in all versions up to, and including, 5.5.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerable code path is only reachable when a gallery item is rendered as a link (i.e., link_href is non-empty), and exploitation relies on the fact that WordPress's sanitize_text_field() strips angle-bracketed tags but preserves double quotes, allowing an attacker to break out of the aria-label attribute context and inject event-handler attributes such as onclick.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
tigroumeow Meow Gallery 0 ~ 5.5.1 -

II. Public POCs for CVE-2026-9239

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III. Intelligence Information for CVE-2026-9239

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Other References for CVE-2026-9239 (8)

Same Patch Batch · tigroumeow · 2026-10-30 · 4 CVEs total

CVE-2025-8574 8.7 HIGH Database Cleaner <= 1.4.7 - Authenticated (Administrator+) Arbitrary Table Deletion
CVE-2026-110732 7.5 HIGH AI Engine – The Chatbot, AI Framework & MCP for WordPress <= 3.8.6 - Missing Authorization
CVE-2026-13747 6.5 MEDIUM Meow Gallery <= 5.5.4 - Missing Authorization to Authenticated (Author+) Information Discl

IV. Related Vulnerabilities

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