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CVE-2026-66599— WordPress WPComplete plugin <= 2.9.5.6 - Cross Site Scripting (XSS) vulnerability

Quick assessment

Affected
Liquid Web / 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.

Nexcess WPComplete是Nexcess公司的一款WordPress插件，用于完善购买流程。 Nexcess WPComplete 2.9.5.6及之前版本存在跨站脚本漏洞，该漏洞源于容易受到未经身份验证的跨站脚本攻击。

CVSS 7.1 · High EPSS 0.25% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
Liquid Web / StellarWP WPComplete n/a≤ 2.9.5.6 affected
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I. Basic Information for CVE-2026-66599

Vulnerability Information
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Vulnerability Title
WordPress WPComplete plugin <= 2.9.5.6 - Cross Site Scripting (XSS) vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Unauthenticated Cross Site Scripting (XSS) in WPComplete <= 2.9.5.6 versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
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
Nexcess WPComplete 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nexcess WPComplete是Nexcess公司的一款WordPress插件，用于完善购买流程。 Nexcess WPComplete 2.9.5.6及之前版本存在跨站脚本漏洞，该漏洞源于容易受到未经身份验证的跨站脚本攻击。
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
Liquid Web / StellarWP WPComplete n/a ~ 2.9.5.6 -

II. Public POCs for CVE-2026-66599

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III. Intelligence Information for CVE-2026-66599

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News Coverage for CVE-2026-66599 (1)

IV. Related Vulnerabilities

Same product: WPComplete
Same vendor: Liquid Web / StellarWP
Same weakness: CWE-79