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CVE-2026-73576

Published: Aug 13, 2026Updated: Aug 28, 2026 Sources: CVE List NVDCWE-1241
6.3MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 90.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:CC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-1241

Affected Products

Zimbra
commercialaka zimbra collaboration server
CollaborationOn-premDesktop App
Enterprise Software / collaboration-groupware
synacor
commercial·US
zimbra collaboration suiteOn-premWeb App
Communications / email-server-client

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-73576?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
wiki.zimbra.com
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
wiki.zimbra.com

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