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CVE-2026-19760— WP Fastest Cache <= 1.5.0 - Unauthenticated Stored Cross-Site Scripting via HTTP Host Header

Quick assessment

Affected
emrevona WP Fastest Cache – WordPress Cache Plugin
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 缓存插件 WP Fastest Cache 在所有 1.5.0 及以下版本中存在存储型跨站脚本漏洞（Stored Cross-Site Scripting, XSS），该漏洞源于对 HTTP Host 头部输入缺乏充分的净化和输出转义。攻击者无需认证即可将恶意 Web 脚本注入页面，当其他用户访问被注入的页面时，这些脚本将会被执行。 此漏洞的利用需要同时满足以下条件：必须启用 Polylang 或 Polylang Pro 插件，并且必须开启“Combine JS”（合并 JavaScript）

CVSS 7.2 · High
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I. Basic Information for CVE-2026-19760

Vulnerability Information
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Vulnerability Title
WP Fastest Cache <= 1.5.0 - Unauthenticated Stored Cross-Site Scripting via HTTP Host Header
Source: CVE Program / CVE List V5
Vulnerability Description
The WP Fastest Cache – WordPress Cache Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via HTTP Host Header in all versions up to, and including, 1.5.0 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 Polylang or Polylang Pro plugin to be active and the Combine JS option to be enabled, as these conditions trigger the vulnerable Host-header-to-URL code path that writes attacker-controlled script src values into the shared page-cache file served to all subsequent visitors.
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
emrevona WP Fastest Cache – WordPress Cache Plugin 0 ~ 1.5.0 -

II. Public POCs for CVE-2026-19760

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III. Intelligence Information for CVE-2026-19760

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Patches & Fixes for CVE-2026-19760 (4)

Vendor Advisories for CVE-2026-19760 (1)

IV. Related Vulnerabilities

Same product: WP Fastest Cache – WordPress Cache Plugin
Same vendor: emrevona
Same weakness: CWE-79

V. Comments for CVE-2026-19760

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