Medium severity · published Oct 14, 2026
CVE-2026-93635
Zimbra Collaboration Suite LDAP Filter Injection via Unescaped computeDn() Template Substitution
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
LDAP filter injection in Zimbra Collaboration Suite 10.1.0 through 10.1.21 allows unauthenticated attackers to alter external LDAP search filters. On domains using search-filter authentication and lazy provisioning, this creates a password oracle for external directory users. Authenticated S/MIME lookups can also return certificates and identity data for unintended directory entries.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
Collaboration · Zimbra
through 10.1.21 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93635
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-93635
third-party-advisory
https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1
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