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Vulnerability DatabaseCVE-2023-26562

CVE-2023-26562: 
Zimbra Collaboration Server vulnerability analysis and mitigation

Overview

CVE-2023-26562 affects Zimbra Collaboration (ZCS) versions 8.8.15 and 9.0. The vulnerability allows a closed account (with 2FA and generated passwords) to send e-mail messages when configured for Imap/smtp (NVD, CVE).

Technical details

The vulnerability has been assigned a CVSS v3.1 Base Score of 6.5 (MEDIUM) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N. It is classified as CWE-862 (Missing Authorization) (NVD).

Impact

The vulnerability allows unauthorized email sending from closed accounts that have 2FA and generated passwords configured, potentially leading to security policy bypass and unauthorized communications (Security Center).

Mitigation and workarounds

The vulnerability has been fixed in multiple versions: ZCS 9.0.0 Patch 30, 8.8.15 Patch 37. Administrators should upgrade to these patched versions to address the vulnerability (Security Center).

Additional resources

Source: This report was generated using AI

Related Zimbra Collaboration Server vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2025-68645HIGH8.8
  • Zimbra Collaboration ServerZimbra Collaboration Server
  • cpe:2.3:a:zimbra:collaboration
NoYesDec 22, 2025
CVE-2025-66376HIGH7.2
  • Zimbra Collaboration ServerZimbra Collaboration Server
  • cpe:2.3:a:zimbra:collaboration
NoYesJan 05, 2026
CVE-2024-45515MEDIUM6.1
  • Zimbra Collaboration ServerZimbra Collaboration Server
  • cpe:2.3:a:zimbra:collaboration
NoYesJul 30, 2025
CVE-2025-62763MEDIUM5
  • Zimbra Collaboration ServerZimbra Collaboration Server
  • cpe:2.3:a:zimbra:collaboration
NoYesOct 21, 2025
CVE-2025-67809MEDIUM4.7
  • Zimbra Collaboration ServerZimbra Collaboration Server
  • cpe:2.3:a:zimbra:collaboration
NoYesDec 15, 2025

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