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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.

litespeedtech litespeed cache是litespeedtech公司开源的一款网站性能加速插件。 litespeedtech litespeed cache 7.7及之前版本存在跨站脚本漏洞，该漏洞源于用于去除图片width和height属性的正则表达式存在缺陷，可能导致经过身份验证的攻击者（作者级别及以上权限）在页面中注入任意Web脚本，当用户访问被注入的页面时执行。

CVSS 6.4 · Medium EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
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
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 7.7及之前版本存在跨站脚本漏洞，该漏洞源于用于去除图片width和height属性的正则表达式存在缺陷，可能导致经过身份验证的攻击者（作者级别及以上权限）在页面中注入任意Web脚本，当用户访问被注入的页面时执行。
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 ~ 7.7 -

II. Public POCs for CVE-2026-3129

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III. Intelligence Information for CVE-2026-3129

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Vendor Advisories for CVE-2026-3129 (1)

Security Blog Posts for CVE-2026-3129 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-3129

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