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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 WP Fastest Cache是WordPress基金会的一款WordPress缓存插件。 WordPress WP Fastest Cache 1.5.0及之前版本存在跨站脚本漏洞，该漏洞源于对HTTP Host Header的输入清理和输出转义不足，可能导致未经身份验证的攻击者注入任意Web脚本并在用户访问注入页面时执行。

CVSS 7.2 · High EPSS 0.40% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
emrevona WP Fastest Cache – WordPress Cache Plugin ≤ 1.5.0 affected
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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
Vulnerability Title
WordPress WP Fastest Cache 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress WP Fastest Cache是WordPress基金会的一款WordPress缓存插件。 WordPress WP Fastest Cache 1.5.0及之前版本存在跨站脚本漏洞，该漏洞源于对HTTP Host Header的输入清理和输出转义不足，可能导致未经身份验证的攻击者注入任意Web脚本并在用户访问注入页面时执行。
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

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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