CVE-2026-125389
Received Received - Intake

Stored XSS in Group-Office Email Viewer via SVG/onload

Publication date: 2026-11-10

Last updated on: 2026-11-10

Assigner: VulnCheck

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.

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Meta Information

Published
2026-11-10
Last Modified
2026-11-10
Generated
2026-11-10
AI Q&A
2026-11-10
EPSS Evaluated
N/A
NVD
CVE-2026-125389
EUVD
EUVD-2026-120552

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
Intermesh Group-Office From 0 (inc) to 6.8.181 (exc)
Intermesh Group-Office From 25.0.0 (inc) to 25.0.116 (exc)
Intermesh Group-Office From 26.0.0 (inc) to 26.0.58 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

CVE-2026-125389 is a stored cross-site scripting (XSS) vulnerability in Intermesh Group-Office email system versions before 6.8.181, 25.0.116, and 26.0.58. The flaw exists in the StringHelper::filterXSS function due to an ineffective regex that fails to block malicious HTML tags like svg/onload. When a victim opens a crafted email, the raw HTML executes JavaScript in their session.

Detection Guidance

To detect this vulnerability, inspect Group-Office email content for raw HTML tags like <svg/onload>, <img/src=x/onerror>, or <img alt=> onerror=>. Check if emails bypass sanitization by viewing message source in MessagePanel.js. Verify if StringHelper::filterXSS or sanitizeHtml() functions are present in StringHelper.php and if they fail to remove active content.

Impact Analysis

Attackers can send emails with malicious scripts that execute when viewed, potentially stealing session cookies, performing actions on your behalf, or taking over your account. The vulnerability allows account compromise across all Group-Office modules due to shared session and CSRF tokens.

Compliance Impact

This vulnerability could violate compliance with GDPR and HIPAA by enabling stored XSS attacks that compromise user sessions. Attackers could execute arbitrary scripts in email viewers, potentially accessing or modifying sensitive data, which conflicts with GDPR's data protection requirements and HIPAA's safeguards for protected health information.

Mitigation Strategies

Immediately upgrade Group-Office to versions 6.8.181, 25.0.116, or 26.0.58 or later. Replace regex-based sanitization with DOMDocument-based parsing in StringUtil::removeActiveContent(). Disable raw HTML rendering in MessagePanel.js and implement strict input validation for email content.

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