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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.

litespeedtech litespeed cache是litespeedtech公司开源的一款网站性能加速插件。 litespeedtech litespeed cache 7.8.1及之前版本存在跨站脚本漏洞，该漏洞源于对评论内容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，并在用户访问时执行。

CVSS 7.2 · High EPSS 0.37% · P29

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
Vulnerability Title
litespeedtech litespeed cache 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
litespeedtech litespeed cache是litespeedtech公司开源的一款网站性能加速插件。 litespeedtech litespeed cache 7.8.1及之前版本存在跨站脚本漏洞，该漏洞源于对评论内容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
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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