CVE-2026-93636 json
Zimbra Collaboration Suite LDAP Filter Injection via Calendar Resource Attribute Name
published 2026-10-23 17 d ago modified 2026-10-28 11 d ago also EUVD-2026-108975
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
An LDAP filter injection vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user to query otherwise unreturned attributes of calendar resources through SearchCalendarResourcesRequest. Zimbra escapes search values but inserts the supplied attribute names directly into LDAP filter expressions without validation. An attacker can inject additional conditions and use repeated matching queries to recover readable resource attributes such as internal mailbox hostnames and mail transport routes. The search remains restricted to calendar-resource objects and the LDAP service account's access rights. ZCS 10.1.16 and 10.1.21 are affected.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 11 d ago
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- rapid7.com https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected products
- Zimbra Zimbra Collaboration Suite
Classification
- Weakness
-
- CWE-90 Improper Neutralization of Special Elements used in an LDAP Query
References
-
rapid7.com
/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/
related, exploit, third-party-advisory
-
wiki.zimbra.com
/wiki/Zimbra_Security_Advisories
vendor-advisory
Sources
- CVE List CVE-2026-93636
- NVD CVE-2026-93636
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