{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23901","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","state":"PUBLISHED","assignerShortName":"apache","dateReserved":"2026-01-17T18:01:53.140Z","datePublished":"2026-02-10T09:25:51.765Z","dateUpdated":"2026-02-10T15:31:25.166Z"},"containers":{"cna":{"affected":[{"collectionURL":"https://repo.maven.apache.org/maven2","defaultStatus":"unaffected","packageName":"org.apache.shiro:shiro-core","product":"Apache Shiro","vendor":"Apache Software Foundation","versions":[{"lessThan":"2.0.7","status":"affected","version":"0","versionType":"semver"}]}],"credits":[{"lang":"en","type":"finder","value":"4ra1n"},{"lang":"en","type":"finder","value":"Y4tacker"},{"lang":"en","type":"remediation developer","value":"lprimak"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>Observable Timing Discrepancy vulnerability in Apache Shiro.</p><p>This issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.</p><p>Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue.</p>Prior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough,<br>that a brute-force attack may be able to tell, by timing the requests only, determine if<br>the request failed because of a non-existent user vs. wrong password.<br><br>The most likely attack vector is a local attack only.<br>Shiro security model&nbsp;<a target=\"_blank\" rel=\"nofollow\" href=\"https://shiro.apache.org/security-model.html#username_enumeration\">https://shiro.apache.org/security-model.html#username_enumeration</a>&nbsp;discusses this as well.<br><br>Typically, brute force attack can be mitigated at the infrastructure level."}],"value":"Observable Timing Discrepancy vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7 or later, which fixes the issue.\n\nPrior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough,\nthat a brute-force attack may be able to tell, by timing the requests only, determine if\nthe request failed because of a non-existent user vs. wrong password.\n\nThe most likely attack vector is a local attack only.\nShiro security model  https://shiro.apache.org/security-model.html#username_enumeration  discusses this as well.\n\nTypically, brute force attack can be mitigated at the infrastructure level."}],"metrics":[{"cvssV4_0":{"Automatable":"YES","Recovery":"AUTOMATIC","Safety":"NEGLIGIBLE","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":1,"baseSeverity":"LOW","privilegesRequired":"LOW","providerUrgency":"GREEN","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"CONCENTRATED","vectorString":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/S:N/AU:Y/R:A/V:C/RE:L/U:Green","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"LOW"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]},{"other":{"content":{"text":"low"},"type":"Textual description of severity"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-208","description":"CWE-208 Observable Timing Discrepancy","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","shortName":"apache","dateUpdated":"2026-02-10T09:25:51.765Z"},"references":[{"tags":["vendor-advisory"],"url":"https://lists.apache.org/thread/mm1jct9b86jvnh3y44tj22xvjtx3xhhh"}],"source":{"discovery":"UNKNOWN"},"title":"Apache Shiro: Brute force attack possible to determine valid user names","x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/02/08/2"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-02-10T10:22:44.721Z"}},{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-10T15:31:09.515973Z","id":"CVE-2026-23901","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-02-10T15:31:25.166Z"}}]}}