CVE-2026-76579— LiteSpeed Cache <= 7.9 - Reflected Cross-Site Scripting via ESI 'esi' Parameter
Quick assessment
Affected
litespeedtech LiteSpeed Cache
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 LiteSpeed Cache 插件存在反射型跨站脚本（Reflected Cross-Site Scripting）漏洞，影响 7.9 及之前所有版本。该漏洞由 参数缺乏足够的输入净化和输出转义所导致。 未认证的 attackers 若能让用户点击链接或执行特定操作，即可在页面中注入任意 Web 脚本。利用该漏洞时，攻击者需要在 GET 查询字符串中提供一个有效签名的 值，同时通过 POST 请求体提交一个由攻击者控制的 载荷，并依赖 PHP 中 默认的合并顺序（POST 优先于 GET）
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-76579
Vulnerability Information
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Vulnerability Title
LiteSpeed Cache <= 7.9 - Reflected Cross-Site Scripting via ESI 'esi' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The LiteSpeed Cache plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'esi' parameter in all versions up to, and including, 7.9 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Exploitation requires that the attacker supply a validly signed 'esi' value in the GET query string while submitting a separate attacker-controlled 'esi' payload as a POST body field, relying on PHP's default $_REQUEST merge order to have the POST value take precedence at the point of execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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 |
|---|---|---|---|---|
| litespeedtech | LiteSpeed Cache | 0 ~ 7.9 | - |
|
II. Public POCs for CVE-2026-76579
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-76579 (2)
Vendor Advisories for CVE-2026-76579 (1)
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