SB2026110985 - Cross-site scripting in Group Office

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Main Vulnerability Database SB2026110985

SB2026110985 - Cross-site scripting in Group Office

Published: November 9, 2026

Security Bulletin ID SB2026110985
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Cross-site scripting (CVE-ID: CVE-2026-45551)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]


The vulnerability allows a low-privileged authenticated attacker to execute stored JavaScript in an administrator's browser and escalate privileges in GroupOffice.

The vulnerability exists due to missing authorization for cross-user setting changes and unescaped insertion of email_font_size into the email module's JavaScript when the web client loads. A low-privileged authenticated attacker can store a malicious setting for an administrator, causing execution when that administrator opens the web interface and enabling promotion of the attacker's account to administrator.


Remediation

Install update from vendor's website.

References