Is there a public exploit for CVE-2026-100252?

No public exploit for CVE-2026-100252 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-100252?

CVE-2026-100252 scores CVSS 8.6 (v4.0), rated high.

What does CVE-2026-100252 affect?

CVE-2026-100252 affects Apache Software Foundation Apache ZooKeeper.

8.6 High

Improper Authorization vulnerability in Apache ZooKeeper.

CVE-2026-100252

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.authtolocal 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 authtolocal 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.

Assessment

CVSS: 8.6 (v4.0)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 4 November 2026
Last updated: 5 November 2026
Affected: Apache Software Foundation · Apache ZooKeeper
Assigner: apache

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

https://lists.apache.org/thread.html/81rdyqlmlp3dtkkqgp8t5080g3b9r2pj

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