# CVE-2026-73576

## Summary

- **CVE ID:** CVE-2026-73576
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N)
- **CWE:** CWE-1241
- **Published:** Aug 13, 2026
- **Last Modified:** Aug 13, 2026

## 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.

## Affected Products

- Zimbra — Collaboration (0)

## References

- [CNA](https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)
- [CNA](https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.19%
- **EPSS Percentile:** 9.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._