CVE-2026-50053 Zimbra Collaboration Suite - Stored XSS

Zimbra Collaboration Suite contains a request attribute override vulnerability caused by unauthenticated requests to /h/* populating servlet attributes, letting attackers execute JavaScript in another user's session combined with CVE-2026-10632, exploit requires attacker to supply valid token and document identifiers.

CVSS base score 8.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.42% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Stored XSS
Impact
Client Script Exec
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Published
23 October 2026
Updated
25 October 2026
Weakness
CWE-642

Vendor fix

Update to version 10.1.17 or later.

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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