EUVD Vulnerability Catalog
EUVD-2026-112941
Severity: MEDIUM
Base Score: 5.3
CVSS Version: 4.0
Vulnerability Description
Zimbra is vulnerable to stored cross-site scripting (XSS) via the Content-Location MIME header in email attachments. Due to lack of sanitization of the Content-Location header, an attacker can set it to a javascript: URI. An unauthenticated remote attacker can send a crafted email to a victim; when the victim opens the email in the Zimbra web interface and clicks the attachment name, the JavaScript payload executes in the victim's browser context. This issue was fixed in version 10.1.21
CVSS Vector Analysis
Below is the complete, human-readable breakdown of the CVSS metric string: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
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Attack Vector (AV): Network
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Attack Complexity (AC): Low
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Attack Requirements (AT): None
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Privileges Required (PR): None
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User Interaction (UI): Passive
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Vulnerability Confidentiality Impact (VC): None
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Vulnerability Integrity Impact (VI): None
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Vulnerability Availability Impact (VA): None
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Subsequent Confidentiality Impact (SC): Low
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Subsequent Integrity Impact (SI): Low
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Subsequent Availability Impact (SA): None
Affected Vendors & Systems
Vendor
Synacor
References & Advisory Links
Metadata Profile
Database Authority
European Union Agency for Cybersecurity (ENISA) EUVD
Assigner
CERT-PL
EPSS Probability
0
Known Aliases
CVE-2026-66911
GHSA-4r7g-97vg-fv7w
Published On
2026-10-29
Last Updated
2026-10-29