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Vulnerability DatabaseCVE-2023-43103

CVE-2023-43103: 
Zimbra Collaboration Server vulnerability analysis and mitigation

Overview

A Cross-Site Scripting (XSS) vulnerability was discovered in Zimbra Collaboration (ZCS) before version 10.0.4, tracked as CVE-2023-43103. The vulnerability exists due to an unsanitized parameter in a web endpoint. The issue was also addressed in 8.8.15 Patch 43 and 9.0.0 Patch 36 (Zimbra Advisory, NVD).

Technical details

The vulnerability is classified as a Cross-Site Scripting (XSS) issue with a CVSS v3.1 Base Score of 6.1 MEDIUM (Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N). The vulnerability is related to improper neutralization of input during web page generation (CWE-79) (NVD).

Impact

The XSS vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the web application, potentially leading to information disclosure and unauthorized actions in the user's session (NVD).

Mitigation and workarounds

The vulnerability has been fixed in Zimbra Collaboration version 10.0.4, 8.8.15 Patch 43, and 9.0.0 Patch 36. Users are strongly advised to upgrade to these or later versions to mitigate the security risk (Zimbra Advisory).

Community reactions

The vulnerability was reported by security researcher Sk4nd4 (https://twitter.com/Sk4nd4), demonstrating ongoing security research and responsible disclosure in the cybersecurity community (Zimbra Advisory).

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
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CVE-2025-66376HIGH7.2
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CVE-2024-45515MEDIUM6.1
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  • cpe:2.3:a:zimbra:collaboration
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CVE-2025-62763MEDIUM5
  • Zimbra Collaboration ServerZimbra Collaboration Server
  • cpe:2.3:a:zimbra:collaboration
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CVE-2025-67809MEDIUM4.7
  • Zimbra Collaboration ServerZimbra Collaboration Server
  • cpe:2.3:a:zimbra:collaboration
NoYesDec 15, 2025

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