CVE-2026-73576
Medium
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.
SeverityMedium
CVSS6.3
Exploit probability—
Product
Synacor Zimbra Collaboration Suite
PublishedAug 13, 2026
First seenAug 13, 2026
Weakness typeCWE-1241CWE-1241
How to fix
Update
- synacor zimbra_collaboration_suite10.1.17 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| synacor zimbra_collaboration_suite | v < 10.1.17 | 10.1.17 |
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