What is CVE-2026-73576?
A weak cryptographic key generation vulnerability exists in the OnlyOffice integration of Zimbra Collaboration Suite (ZCS) before version 10.1.17. The `zimbraDocumentEditingJwtSecret` is created using an insecure random number generator with insufficient entropy, allowing an attacker who obtains a JWT to potentially crack the signature and perform unauthorized actions. Users should immediately upgrade to ZCS 10.1.17 or later.
Azərbaycanca: Zimbra Collaboration Suite (ZCS)-in 10.1.17 versiyasından əvvəlki versiyalarında OnlyOffice inteqrasiyasında zəif kriptoqrafik açar generasiyası (CWE-338) aşkarlanıb. `zimbraDocumentEditingJwtSecret` açarı qeyri-kafi entropiya ilə yaradıldığı üçün təcavüzkar JWT tokeni ələ keçirərsə, imzanı sındırıb icazəsiz əməliyyatlar apara bilər. ZCS istifadəçiləri dərhal 10.1.17 və ya daha yeni versiyaya yeniləməlidirlər.
Related CVEs
link basis: same weakness class CWE-798
FAQ2
What is the vulnerability in the OnlyOffice integration of Zimbra Collaboration Suite?
In ZCS versions before 10.1.17, the `zimbraDocumentEditingJwtSecret` is generated with insufficient entropy (CWE-338), allowing an attacker who obtains a JWT to crack the signature and perform unauthorized actions.
How can I protect against CVE-2026-73576?
ZCS users should immediately upgrade to version 10.1.17 or later.
See also6
This explainer is AI-written from source data — skopnix's own reporting on this CVE; CVSS scores, vendors and versions are never invented. See NVD for the official record.