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CVE-2026-18978— LiteSpeed Cache <= 7.8.1 - Unauthenticated Stored Cross-Site Scripting via Comment Content

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 插件在所有版本（包括 7.8.1 及更早版本）中，由于输入清理和输出转义不足，存在存储型跨站脚本（Stored Cross-Site Scripting, XSS）漏洞。这使得未经身份验证的攻击者能够在页面中注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本会被执行。 攻击载荷完全由十进制数字字符引用（例如 、 、 ）组成，并放置在允许的元素（如 ）内部，从而绕过了 WordPress 的 清理机制。原因是 不会将文本内容中的 子字符串视为 HTML

CVSS 7.2 · High EPSS 0.27% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
litespeedtech LiteSpeed Cache ≤ 7.8.1 affected
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I. Basic Information for CVE-2026-18978

Vulnerability Information
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Vulnerability Title
LiteSpeed Cache <= 7.8.1 - Unauthenticated Stored Cross-Site Scripting via Comment Content
Source: CVE Program / CVE List V5
Vulnerability Description
The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content in all versions up to, and including, 7.8.1 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. A comment payload crafted exclusively from decimal numeric character references (e.g. &#34;, &#60;, &#62;) placed inside an allowed element such as &lt;code&gt; bypasses WordPress's wp_kses sanitization, as kses does not treat a data-settings="..." substring within text content as an HTML attribute, allowing the malicious payload to reach the vulnerable function. For this to be exploitable, the site must allow users with previously approved comments to write new comments, and the require_name_email setting must be disabled.
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
litespeedtech LiteSpeed Cache 0 ~ 7.8.1 -

II. Public POCs for CVE-2026-18978

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III. Intelligence Information for CVE-2026-18978

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Patches & Fixes for CVE-2026-18978 (2)

Other References for CVE-2026-18978 (1)

IV. Related Vulnerabilities

Same product: LiteSpeed Cache
Same vendor: litespeedtech
Same weakness: CWE-79

V. Comments for CVE-2026-18978

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