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CVE-2026-73576

Quick assessment

Affected
Zimbra Collaboration
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Zimbra Collaboration (ZCS) 10.1.17 版本之前，OnlyOffice 集成中存在一个弱加密密钥生成漏洞。其中， 是使用一个不安全的随机数生成器生成的，导致熵值不足。攻击者若获取到使用该密钥签名的 JWT（JSON Web Token），可能能够通过离线暴力破解的方式恢复出 JWT 签名密钥，从而可能实现 JWT 伪造。

CVSS 6.3 · Medium EPSS 0.19% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zimbra Collaboration < 10.1.17 affected
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I. Basic Information for CVE-2026-73576

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1241
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zimbra Collaboration 0 ~ 10.1.17 -

II. Public POCs for CVE-2026-73576

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III. Intelligence Information for CVE-2026-73576

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Vendor Advisories for CVE-2026-73576 (1)

Same Patch Batch · Zimbra · 2026-08-13 · 7 CVEs total

CVE-2026-73570 8.9 HIGH Zimbra<10.1.20 SNMP未授权远程代码执行漏洞
CVE-2026-73572 6.1 MEDIUM Zimbra <10.1.17 存储型XSS漏洞
CVE-2026-73575 3.1 LOW ZCS<10.1.17 CSRF漏洞
CVE-2026-73573 3.1 LOW Zimbra Collaboration <10.1.17 路径穿越漏洞
CVE-2026-73571 3.1 LOW Zimbra Collaboration <10.1.17 授权绕过漏洞
CVE-2026-73574 3.1 LOW Zimbra<10.1.17经典Web客户端LFI漏洞

IV. Related Vulnerabilities

Same product: Collaboration
Same vendor: Zimbra
Same weakness: CWE-1241

V. Comments for CVE-2026-73576

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