CVE-2026-73572: CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') in Zimbra Collaboration
In Zimbra Collaboration (ZCS) before 10.1.17, a stored cross-site scripting (XSS) vulnerability exists in the Zimbra Classic Web Client due to insufficient sanitization of specific attachment content during inline preview. An attacker can send a crafted email containing a malicious attachment that, when previewed by a user, executes arbitrary JavaScript within the victim's browser session. Successful exploitation may allow an attacker to perform unauthorized actions on behalf of the victim user, potentially leading to data exfiltration or unauthorized access to sensitive information.
AI Analysis
Technical Summary
CVE-2026-73572 is a stored XSS vulnerability in Zimbra Collaboration Server (ZCS) versions prior to 10.1.17. The vulnerability arises from improper neutralization of input in the Zimbra Classic Web Client's inline preview feature for attachments. When a user previews a maliciously crafted attachment, arbitrary JavaScript can execute within the user's browser context. This may allow attackers to perform unauthorized actions and access sensitive information by leveraging the victim's session.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session, potentially enabling unauthorized actions such as data exfiltration or access to sensitive information. The vulnerability does not impact availability but affects confidentiality and integrity to a limited extent.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or workaround information is provided at this time. Users should exercise caution when previewing attachments from untrusted sources until a fix is available.
CVE-2026-73572: CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') in Zimbra Collaboration
Description
In Zimbra Collaboration (ZCS) before 10.1.17, a stored cross-site scripting (XSS) vulnerability exists in the Zimbra Classic Web Client due to insufficient sanitization of specific attachment content during inline preview. An attacker can send a crafted email containing a malicious attachment that, when previewed by a user, executes arbitrary JavaScript within the victim's browser session. Successful exploitation may allow an attacker to perform unauthorized actions on behalf of the victim user, potentially leading to data exfiltration or unauthorized access to sensitive information.
CVSS v3.1
Score 6.1medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-73572 is a stored XSS vulnerability in Zimbra Collaboration Server (ZCS) versions prior to 10.1.17. The vulnerability arises from improper neutralization of input in the Zimbra Classic Web Client's inline preview feature for attachments. When a user previews a maliciously crafted attachment, arbitrary JavaScript can execute within the user's browser context. This may allow attackers to perform unauthorized actions and access sensitive information by leveraging the victim's session.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session, potentially enabling unauthorized actions such as data exfiltration or access to sensitive information. The vulnerability does not impact availability but affects confidentiality and integrity to a limited extent.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or workaround information is provided at this time. Users should exercise caution when previewing attachments from untrusted sources until a fix is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-08-12T21:51:54.435Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7de5d0bf8831d5396651c0
Added to database: 08/13/2026, 15:42:08 UTC
Last enriched: 08/13/2026, 15:58:25 UTC
Last updated: 08/13/2026, 16:27:22 UTC
Views: 4
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