CVE-2026-93631 Zimbra Collaboration Suite - Cross-Site Request Forgery

Zimbra Collaboration Suite (ZCS) Network Edition 10.1.16 and 10.1.20 contains a cross-site request forgery caused by OAuth callback not binding state or authorization code to session, letting attackers link external accounts to victim mailboxes, exploit requires victim to be signed in and load malicious callback.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Cross-Site Request Forgery
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Published
23 October 2026
Updated
25 October 2026
Weakness
CWE-352

Vendor fix

Update to a version later than 10.1.20 or apply vendor patches.

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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