CVE-2026-100252 - Apache ZooKeeper: SASL authorization bypass on the client port through a client-supplied authorization ID

CVE-2026-100252 - Apache ZooKeeper: SASL authorization bypass on the client port through a client-supplied authorization ID

https://cvefeed.io/rssfeed/latest.atom / Wed, 11/04/2026 - 13:43
CVE ID :CVE-2026-100252
Published : Nov. 4, 2026, 11:17 a.m. | 1 hour, 9 minutes ago
Description :Improper Authorization vulnerability in Apache ZooKeeper. When SASL authentication is enabled on the client port, the server's SASL callback handler grants every authorization identity (authzid) that a client requests, without checking it against the principal the client authenticated as. The server then tries to replace the requested identity with a canonical form of the authenticated principal, derived from the zookeeper.security.auth_to_local rules. If no rule applies to the principal, canonicalization fails and the error is only logged. The client-requested authzid then becomes the session's SASL identity for all ACL checks. An authenticated client whose principal is not covered by the auth_to_local rules can therefore claim any SASL identity. With the default rules, this includes any Kerberos principal from a realm other than the server's default realm, such as a principal from a cross-realm trusted realm. The client then gets the permissions granted to that identity in sasl ACLs. If the requested identity matches a configured zookeeper.superUser, it gets superuser access to the whole data tree. Users are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.
Severity: 8.6 | HIGH
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