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CVE-2026-66636— WordPress Wise Chat plugin <= 3.4.3 - Cross Site Scripting (XSS) vulnerability

Quick assessment

Affected
Marcin Wise Chat
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.

Marcin Wise Chat是Marcin公司开源的一款提供实时聊天功能的CMS插件。 Marcin Wise Chat 3.4及之前版本存在跨站脚本漏洞，该漏洞源于容易受到跨站脚本攻击。

CVSS 6.5 · Medium EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Marcin Wise Chat ≤ 3.4.3 affected
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I. Basic Information for CVE-2026-66636

Vulnerability Information
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Vulnerability Title
WordPress Wise Chat plugin <= 3.4.3 - Cross Site Scripting (XSS) vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Marcin Wise Chat wise-chat allows Stored XSS.This issue affects Wise Chat: from n/a through 3.4.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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
Marcin Wise Chat 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Marcin Wise Chat是Marcin公司开源的一款提供实时聊天功能的CMS插件。 Marcin Wise Chat 3.4及之前版本存在跨站脚本漏洞，该漏洞源于容易受到跨站脚本攻击。
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
Marcin Wise Chat 0 ~ 3.4.3 -

II. Public POCs for CVE-2026-66636

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III. Intelligence Information for CVE-2026-66636

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Other References for CVE-2026-66636 (1)

IV. Related Vulnerabilities

Same product: Wise Chat
Same vendor: Marcin
Same weakness: CWE-79

V. Comments for CVE-2026-66636

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