CVE-2026-18109— W3 Total Cache <= 2.10.3 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name
Possible ATT&CK Techniques 2AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| boldgrid | W3 Total Cache | ≤ 2.10.3 | affected |
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I. Basic Information for CVE-2026-18109
Vulnerability Information
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Vulnerability Title
W3 Total Cache <= 2.10.3 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name
Source: CVE Program / CVE List V5
Vulnerability Description
The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author Name in all versions up to, and including, 2.10.3 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. This vulnerability is only exploitable when the Lazy Load Images feature of W3 Total Cache is enabled, as the unsafe re-emission occurs exclusively within the LazyLoad mutator's img tag rewriting step.
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
WordPress W3 Total Cache 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress W3 Total Cache是WordPress基金会的一款提升网站性能的缓存插件。 WordPress W3 Total Cache 2.10.3及之前版本存在跨站脚本漏洞，该漏洞源于对评论作者名称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，当用户访问被注入页面时执行。
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 |
|---|---|---|---|---|
| boldgrid | W3 Total Cache | 0 ~ 2.10.3 | - |
II. Public POCs for CVE-2026-18109
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-18109 (4)
Other References for CVE-2026-18109 (1)
IV. Related Vulnerabilities
Same product: W3 Total Cache
- CVE-2026-18051
W3 Total Cache < 2.10.5 - Unauthenticated Arbitrary Director - CVE-2026-66695
WordPress W3 Total Cache plugin <= 2.10.2 - Path Traversal v - CVE-2026-9282
W3 Total Cache <= 2.9.4 - Unauthenticated Arbitrary File Rea - CVE-2026-57623
WordPress W3 Total Cache plugin <= 2.9.4 - Arbitrary Code Ex - CVE-2026-39595
WordPress W3 Total Cache plugin <= 2.9.1 - Broken Access Con
Same vendor: boldgrid
- CVE-2026-66708
WordPress Total Upkeep plugin <= 1.17.2 - Broken Access Cont - CVE-2026-66695
WordPress W3 Total Cache plugin <= 2.10.2 - Path Traversal v - CVE-2026-57428
WordPress Sprout Clients plugin <= 3.2.3 - Cross Site Script - CVE-2026-57418
WordPress Client Invoicing by Sprout Invoices plugin <= 20.8 - CVE-2026-9282
W3 Total Cache <= 2.9.4 - Unauthenticated Arbitrary File Rea
Same weakness: CWE-79
- CVE-2026-64851
Grav Shortcode Core Plugin: Stored XSS in shortcode-core att - CVE-2026-18430
HumHub 1.18.4 - Stored XSS in comment-deletion notifications - CVE-2026-61607
Grav API Plugin: Stored XSS via SVG Upload - API Media Pipel - CVE-2026-40508
OpenEMR < 8.3.0 Stored XSS via Patient Portal Template Impor - CVE-2026-40507
OpenEMR < 8.3.0 Reflected XSS via templateHtml Parameter in
V. Comments for CVE-2026-18109
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