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CVE-2026-125389— Group-Office before 6.8.181, 25.0.116, and 26.0.58 Stored XSS via filterXSS Bypass

Quick assessment

Affected
Intermesh Group-Office
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.

Intermesh Group-Office 在 6.8.181、25.0.116 和 26.0.58 之前的版本中，其邮件查看器存在存储型跨站脚本（XSS）漏洞。该漏洞源于 方法中使用的正则表达式存在缺陷。远程攻击者可发送包含如 等标签的邮件，而 会原样渲染这些内容，导致收件人在打开邮件时，其会话中执行恶意脚本。

CVSS 6.1 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-125389

Vulnerability Information
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Vulnerability Title
Group-Office before 6.8.181, 25.0.116, and 26.0.58 Stored XSS via filterXSS Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Intermesh Group-Office before 6.8.181, 25.0.116, and 26.0.58 contains a stored cross-site scripting vulnerability in the email viewer due to a flawed regex in StringHelper::filterXSS. Remote attackers can send emails containing tags like svg/onload, which MessagePanel.js renders raw, executing script in the recipient's session when opened.
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: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
Intermesh Group-Office 0 ~ 6.8.181 -

II. Public POCs for CVE-2026-125389

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-125389

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Other References for CVE-2026-125389 (6)

Same Patch Batch · Intermesh · 2026-11-09 · 3 CVEs total

CVE-2026-125388 6.5 MEDIUM Group-Office before 6.8.181, 25.0.116, and 26.0.58 Missing Authorization in Forms Report D
CVE-2026-125390 6.5 MEDIUM Group-Office before 6.8.181, 25.0.116, and 26.0.58 Local File Read via processUploadQueue

IV. Related Vulnerabilities

Same product: Group-Office
Same vendor: Intermesh
Same weakness: CWE-79