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CVE-2026-73576 Details

Description

In Zimbra Collaboration (ZCS) before 10.1.17, weak cryptographic key generation vulnerability exists in the OnlyOffice integration. The zimbraDocumentEditingJwtSecret is generated using an insecure random number generator, resulting in insufficient entropy. An attacker who obtains a JWT signed with the generated secret may be able to recover the JWT signing secret through offline brute-force, potentially enabling JWT forgery.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CNA: [email protected]CVSS-B:6.3 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy	[email protected]	Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1241	Use of Predictable Algorithm in Random Number Generator	[email protected]

Affected Products

Product	Versions
synacor zimbra collaboration suite	< 10.1.17
CPE cpe:2.3:a:synacor:zimbra_collaboration_suite:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Aug 28, 2026	Initial Analysis	[email protected]
Aug 13, 2026	New CVE Received	[email protected]
Aug 13, 2026	CVE Modified	CISA-ADP