Vulnerability · Published Oct 14, 2026 · Assigned by rapid7

CVE-2026-93635Zimbra Collaboration Suite LDAP Filter Injection via Unescaped computeDn() Template Substitution

Medium 5.3

In plain English

A medium-severity security flaw in Zimbra Collaboration Suite from Zimbra. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.2%top 84.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Zimbra	Zimbra Collaboration Suite	0 – through 10.1.21

Weakness: CWE-90 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1 third-party-advisory