CVE-2026-73575
Received Received - Intake

Cross-Site Request Forgery in Zimbra Collaboration

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: MITRE

Description
In Zimbra Collaboration (ZCS) before 10.1.17, a Cross-Site Request Forgery (CSRF) vulnerability exists in the Exchange Web Services (EWS) endpoint of Zimbra Collaboration (ZCS) due to insufficient validation of request content types. An attacker can exploit this vulnerability by causing an authenticated user to submit a crafted request, potentially allowing unauthorized actions to be performed on behalf of the victim.

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-13
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-73575
EUVD
EUVD-2026-58074

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
zimbra zimbra_collaboration to 10.1.17 (exc)
zimbra zimbra_collaboration 10.0.16
zimbra zimbra_collaboration 10.1.10

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-352 The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.

Attack-Flow Graph

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Executive Summary

This is a Cross-Site Request Forgery (CSRF) vulnerability in Zimbra Collaboration (ZCS) before version 10.1.17. It affects the Exchange Web Services (EWS) endpoint due to insufficient validation of request content types. An attacker can trick an authenticated user into submitting a specially crafted request, which could allow unauthorized actions to be performed on behalf of the victim.

Impact Analysis

If exploited, this vulnerability could allow an attacker to perform unauthorized actions on your behalf without your knowledge. This might include modifying settings, sending emails, or accessing sensitive data if you are logged into Zimbra. The impact depends on your user privileges within the system.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR or HIPAA as it involves a CSRF flaw in Zimbra Collaboration's EWS endpoint. However, if exploited, it could lead to unauthorized actions on behalf of authenticated users, potentially compromising data integrity or access controls. Organizations must ensure proper mitigation to maintain compliance with data protection regulations.

Mitigation Strategies

Upgrade Zimbra Collaboration (ZCS) to version 10.1.17 or later to address the CSRF vulnerability in the EWS endpoint. Ensure all instances are updated to prevent exploitation.

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