Cross-site scripting in Zimbra Collaboration - #VU134807
Published: June 18, 2026
Vulnerability identifier: #VU134807
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Synacor Inc.
Affected software:
Zimbra Collaboration
Zimbra Collaboration
Detailed vulnerability description
The vulnerability allows a remote attacker to execute script content in the victim's browser.
The vulnerability exists due to cross-site scripting in the Classic UI attachment preview when previewing malicious email attachments. A remote attacker can send a crafted email attachment to execute script content in the victim's browser.
User interaction is required to preview a crafted attachment.
Remediation
Install security update from vendor's website.