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.
Published: 2026-08-13
Score: 6.3 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 13 Aug 2026 17:00:00 +0000

Type Values Removed Values Added
Title Weak JWT Signing Secret Generation Enables Token Forgery in Zimbra Collaboration

Thu, 13 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
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.
First Time appeared Zimbra
Zimbra collaboration
Weaknesses CWE-1241
CPEs cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*
Vendors & Products Zimbra
Zimbra collaboration
References
Metrics cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N'}


Subscriptions

Zimbra Collaboration
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-08-13T15:58:52.960Z

Reserved: 2026-08-12T22:03:36.180Z

Link: CVE-2026-73576

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-13T16:19:06.923

Modified: 2026-08-13T16:19:06.923

Link: CVE-2026-73576

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T18:45:04Z

Weaknesses