SB2026110989 - Server-Side Request Forgery (SSRF) in Group Office

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Main Vulnerability Database SB2026110989

SB2026110989 - Server-Side Request Forgery (SSRF) in Group Office

Published: November 9, 2026

Security Bulletin ID SB2026110989
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) Server-Side Request Forgery (SSRF) (CVE-ID: N/A)

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N]


The vulnerability allows an authenticated remote attacker to make the Group Office server send HTTP requests to internal services through server-side request forgery.

The vulnerability exists due to missing destination IP validation in the calendar subscription component when a calendar containing an attacker-controlled webcalUri is saved. An authenticated remote attacker can create such a calendar to trigger an immediate request and recurring requests every 15 minutes without further interaction.


Remediation

Install update from vendor's website.

References