CVE-2026-3375— LiteSpeed Cache <= 7.7 - Unauthenticated Stored Cross-Site Scripting via QUIC.cloud CCSS/UCSS REST API Endpoints
Possible ATT&CK Techniques 3AI
T1189 · Drive-by Compromise T1071.001 · Web Protocols T1059.007 · JavaScriptAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| litespeedtech | LiteSpeed Cache | ≤ 7.7 | affected |
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I. Basic Information for CVE-2026-3375
Vulnerability Information
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Vulnerability Title
LiteSpeed Cache <= 7.7 - Unauthenticated Stored Cross-Site Scripting via QUIC.cloud CCSS/UCSS REST API Endpoints
Source: NVD (National Vulnerability Database)
Vulnerability Description
The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the /wp-json/litespeed/v1/notify_ccss and /wp-json/litespeed/v1/notify_ucss REST API endpoints in all versions up to, and including, 7.7. These endpoints accept CSS content from QUIC.cloud callback notifications and store it to disk without sanitization. The stored content is later rendered inline frontend page loads without output escaping. The access control protecting these endpoints is IP-based validation that can potentially be bypassed when the WordPress site is deployed behind a reverse proxy, load balancer, or CDN with certain configurations. This makes it possible for unauthenticated attackers, under certain conditions, to inject arbitrary JavaScript into CCSS/UCSS content.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin LiteSpeed Cache 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin LiteSpeed Cache 7.7及之前版本存在跨站脚本漏洞，该漏洞源于通过REST API端点接收CSS内容时未进行清理和输出转义，可能导致未经身份验证的攻击者在特定条件下注入任意JavaScript。
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 ~ 7.7 | - |
II. Public POCs for CVE-2026-3375
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-3375 (3)
Vendor Advisories for CVE-2026-3375 (1)
Other References for CVE-2026-3375 (2)
IV. Related Vulnerabilities
Same product: LiteSpeed Cache
- CVE-2024-51915
WordPress LiteSpeed Cache plugin <= 6.5.2 - Cross Site Scrip - CVE-2025-12450
LiteSpeed Cache <= 7.5.0.1 - Reflected Cross-Site Scripting - CVE-2025-47437
WordPress LiteSpeed Cache plugin <= 7.0.1 - Server Side Requ - CVE-2024-50550
WordPress LiteSpeed Cache plugin <= 6.5.1 - Privilege Escala - CVE-2024-44000
WordPress LiteSpeed Cache plugin < 6.5.0.1 - Unauthenticated
Same vendor: litespeedtech
- CVE-2025-12450
LiteSpeed Cache <= 7.5.0.1 - Reflected Cross-Site Scripting - CVE-2025-54939
Litespeed Technologie LiteSpeed QUIC 安全漏洞 - CVE-2025-24947
Litespeed Technologie LiteSpeed QUIC（LSQUIC） 安全漏洞 - CVE-2024-9169
litespeed cache <= 6.4.1 - Authenticated (Administrator+) St - CVE-2024-3246
LiteSpeed Cache <= 6.2.0.1 - Cross-Site Request Forgery to S
Same weakness: CWE-79
- CVE-2026-7421
Passeum Ticketing <= 1.0 - Authenticated (Administrator+) St - CVE-2026-40108
GLPI Vulnerable to Stored XSS in ITIL Costs - CVE-2026-35212
OpenCTI has XSS in the rendering of email-message observable - CVE-2026-42849
authentik: Reflected XSS in SFE AutosubmitStage allows IDP a - CVE-2026-5385
GLPI 11.0.0 - Stored XSS in knowledge base
V. Comments for CVE-2026-3375
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