CVE-2026-77820— WPComplete <= 2.9.9.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'empty' Shortcode Attribute
Quick assessment
Affected
stellarwp WPComplete
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 WPComplete 插件存在存储型跨站脚本（Stored XSS）漏洞，漏洞源于 'empty' 短代码属性，受影响的版本为 2.9.9.0 及之前所有版本，原因是输入净化不足且输出未正确转义。 这使得拥有贡献者（Contributor）权限或更高权限的已认证攻击者能够向页面中注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将会执行。需要注意的是，利用该漏洞需要软件的高级版（Pro 版本），因此本漏洞仅影响专业版（Pro version）。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-77820
Vulnerability Information
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Vulnerability Title
WPComplete <= 2.9.9.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'empty' Shortcode Attribute
Source: CVE Program / CVE List V5
Vulnerability Description
The WPComplete plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'empty' Shortcode Attribute in all versions up to, and including, 2.9.9.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the premium version of the software in order to exploit. Please note this only affects the pro version.
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 |
|---|---|---|---|---|
| stellarwp | WPComplete | 0 ~ 2.9.9.0 | - |
|
II. Public POCs for CVE-2026-77820
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-77820 (5)
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V. Comments for CVE-2026-77820
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