{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100252","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","state":"PUBLISHED","assignerShortName":"apache","dateReserved":"2026-09-25T16:45:48.869Z","datePublished":"2026-11-04T10:44:17.367Z","dateUpdated":"2026-11-05T04:55:52.687Z"},"containers":{"cna":{"providerMetadata":{"orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","shortName":"apache","dateUpdated":"2026-11-04T10:44:17.367Z"},"title":"Apache ZooKeeper: SASL authorization bypass on the client port through a client-supplied authorization ID","problemTypes":[{"descriptions":[{"description":"CWE-863 Incorrect Authorization","lang":"en","cweId":"CWE-863","type":"CWE"}]}],"source":{"discovery":"UNKNOWN"},"affected":[{"vendor":"Apache Software Foundation","product":"Apache ZooKeeper","packageURL":"pkg:maven/org.apache.zookeeper/zookeeper","versions":[{"status":"affected","version":"3.9.0","lessThanOrEqual":"3.9.6","versionType":"maven"},{"status":"affected","version":"3.8.0","lessThanOrEqual":"3.8.7","versionType":"maven"}],"defaultStatus":"unaffected","collectionURL":"https://repo.maven.apache.org/maven2","packageName":"org.apache.zookeeper:zookeeper"}],"descriptions":[{"value":"Improper Authorization vulnerability in Apache ZooKeeper.\n\nWhen 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.\n\nAn 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.\n\nUsers are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.","lang":"en","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>Improper Authorization vulnerability in Apache ZooKeeper.<br><span><br>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 </span><code>zookeeper.security.auth_to_local</code><span> 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.<br></span><span><br>An authenticated client whose principal is not covered by the </span><code>auth_to_local</code><span> 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 </span><code>sasl</code><span> ACLs. If the requested identity matches a configured </span><code>zookeeper.superUser</code><span>, it gets superuser access to the whole data tree.<br></span><span><br></span><span>Users are recommended to upgrade to version 3.8.8 or 3.9.7, which fixes the issue.</span></p>"}]}],"references":[{"url":"https://lists.apache.org/thread.html/81rdyqlmlp3dtkkqgp8t5080g3b9r2pj","tags":["vendor-advisory"]}],"metrics":[{"other":{"type":"Textual description of severity","content":{"text":"important"}},"scenarios":[{"lang":"en","value":"GENERAL"}]},{"scenarios":[{"lang":"en","value":"GENERAL"}],"format":"CVSS","cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.6,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}}],"credits":[{"lang":"en","value":"cunyi li <xiaoheihei1107@gmail.com>","type":"reporter"},{"lang":"en","value":"Prasath Jayasundar & PayPal Cyber Security Team","type":"reporter"}],"x_generator":{"engine":"Vulnogram 1.0.3"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/11/03/10"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-11-04T11:09:10.129Z"}},{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-11-04T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-100252"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-11-05T04:55:52.687Z"}}]}}