Server-Side Request Forgery (SSRF) in Group Office - #VU162761
Published: November 9, 2026
Vulnerability identifier: #VU162761
CSH Severity: Low
CVSS v4: 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]
CVE-ID: N/A
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Group Office
Remediation
Install security update from vendor's website.
Group Office - addressed in versions 25.0.110, 26.0.38