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Vulnerabilities / CVE-2026-93636

CVE-2026-93636

Published 2026-10-23 · published (not yet in NVD)

CVE-2026-93636

Zimbra Collaboration Suite LDAP Filter Injection via Calendar Resource Attribute Name

4.3 MEDIUM
CVSS 3.1 · CNA
0.3%
chance of exploitation in the next 30 days (EPSS; higher than 27% of CVEs)

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.

Scores

4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NCNA

Affected products

  • Zimbra Zimbra Collaboration Suite: 0 to ≤ 10.1.21

Weakness: CWE-90

2 references (advisories, patches, write-ups)

Sources: CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.

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