CVE-2026-3129— LiteSpeed Cache <= 7.7 - Authenticated (Author+) Stored Cross-Site Scripting via img Tag Attributes
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 插件存在存储型跨站脚本（Stored XSS）漏洞，受影响版本为 7.7 及更早的所有版本。该漏洞源于一个存在缺陷的正则表达式，该正则表达式在启用“Lazy Load Images”和“Add Missing Sizes”功能时，用于从图像中剥离 和 属性。这使得拥有 Author（作者）级别及以上权限的已认证攻击者，能够通过精心构造的 标签属性，在页面中注入任意 Web 脚本。当用户访问这些被注入的页面时，脚本将被执行。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| litespeedtech | LiteSpeed Cache | ≤ 7.7 |
affected |
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I. Basic Information for CVE-2026-3129
Vulnerability Information
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Vulnerability Title
LiteSpeed Cache <= 7.7 - Authenticated (Author+) Stored Cross-Site Scripting via img Tag Attributes
Source: CVE Program / CVE List V5
Vulnerability Description
The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via crafted `<img>` tag attributes in all versions up to, and including, 7.7. This is due to a flawed regular expression that is used to strip `width` and `height` attributes from images when the "Lazy Load Images" and "Add Missing Sizes" features are enabled. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that execute whenever a user accesses an injected page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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 ~ 7.7 | - |
|
II. Public POCs for CVE-2026-3129
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-3129 (1)
Security Blog Posts for CVE-2026-3129 (1)
IV. Related Vulnerabilities
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CVE-2026-18978
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LiteSpeed Cache <= 7.7 - Unauthenticated Stored Cross-Site S -
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CVE-2025-47437
WordPress LiteSpeed Cache plugin <= 7.0.1 - Server Side Requ
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V. Comments for CVE-2026-3129
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