Server-Side Request Forgery (SSRF) in Group Office - CVE-2026-63653
Published: November 9, 2026
Vulnerability identifier: #VU162758
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2026-63653
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated low-privileged attacker to access internal HTTP(S) services through the Group Office server and disclose portions of their responses.
The vulnerability exists due to missing destination validation for the user-controlled URL passed to the bookmarks module's Bookmark/description JMAP action, available in default installations. An authenticated low-privileged attacker can submit an internal or loopback URL and retrieve titles or meta descriptions extracted from the fetched HTML response.
Affected software
Group Office
How to mitigate CVE-2026-63653
Install security update from vendor's website.
Group Office - update to 26.0.37