When OnlyOffice/Document Editing is available, an unauthenticated remote attacker with access to an existing supported public Briefcase document can abuse unsigned save fields to perform path-traversal writes and execute commands as zimbra.
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-87101
Source: Mitre, NVD
Published: 2026-09-25
Updated: 2026-09-29
Base Score: 10
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
Severity: Critical
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.0096