PatchTheCVECVE-2026-73576: In Zimbra Collaboration (ZCS) before 10.1.17, weak cryptographic key generation vulnerability exists in the On
CVE-2026-73576 is a medium-severity flaw (CVSS 6.3) affecting zimbra collaboration suite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 74%) |
| CISA exploited list | No |
| Weakness | CWE-1241 |
| Published | 2026-08-13 |
| Last modified | 2026-08-28 |
Last updated 2026-08-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-73576?
zimbra collaboration suite: upgrade to 10.1.17. Exact commands for each OS are on this page.
Is CVE-2026-73576 being exploited?
CVE-2026-73576 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-73576 affect?
CVE-2026-73576 affects zimbra collaboration suite. Severity is medium (CVSS 6.3). 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 insu
How urgent is CVE-2026-73576?
Priority 29/100. No elevated risk signals yet.
Software pages
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