CVE-2026-93641 Zimbra Classic - Stored XSS

Zimbra Classic contains a stored XSS caused by unauthenticated sender forging share notification, letting attackers access mailbox data and act as victim when signed-in user clicks Accept Share.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.27% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Stored XSS
Impact
Stored XSS, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Published
25 September 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Update to the latest version with XSS fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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