{"id":"CVE-2026-42018","published":"2026-08-12T18:17:29Z","modified":"2026-10-23T19:10:00Z","title":"JFrog Artifactory Improper Authentication Vulnerability","vendor":"JFrog","product":"Artifactory","tier":"core","eol":null,"description":{"text":"JFrog Artifactory could return an internal anonymous-user token to an unauthenticated caller when anonymous access is disabled, potentially exposing sensitive resources.","provenance":"source","from":"NVD"},"summary":{"text":"JFrog Artifactory contains an improper authentication flaw in which the server can return an internal anonymous-user token to an unauthenticated caller. An attacker with network access and no credentials can obtain that token when anonymous access is disabled, potentially gaining access to sensitive resources, and no user interaction or specific configuration beyond anonymous access being disabled is required.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:13:36Z"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.09805,"percentile":0.9554,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-09-11","dueDate":"2026-09-25","ransomware":false,"requiredAction":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","notes":"https://docs.jfrog.com/releases/docs/jfrog-security-advisories ; https://docs.jfrog.com/releases/docs/artifactory-self-managed-releases ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-42018","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-09-10","exploitedFirstSeen":"2026-09-10","ransomware":false,"evidence":[{"url":"https://www.wiz.io/blog/artifactory-under-attack-in-the-wild-exploitation-of-cve-2026-42016-cve-2026-4201","date":"2026-09-10"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-09-11"}],"evidenceTotal":2,"provenance":"source"},"exploited":true,"otx":{"pulseCount":35,"pulses":[{"name":"Actively_Exploited_Kev | Oct 31, 2026","url":"https://otx.alienvault.com/pulse/6ae4aefab0c2191cecd41862","created":"2026-10-30"},{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Artifactory Under Attack: In-the-Wild Exploitation of CVE-2026-42016, CVE-2026-42018 & CVE-2026-82329","url":"https://otx.alienvault.com/pulse/6ae285d1a67781403cef3236","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"JFrog Artifactory Auth Bypass Chain Exploited in the Wild","url":"https://otx.alienvault.com/pulse/6ad8d5546a2cca9babcbb0e8","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"}],"provenance":"machine"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"references":[{"url":"https://docs.jfrog.com/releases/docs/artifactory-self-managed-releases","tags":["Release Notes"]},{"url":"https://docs.jfrog.com/releases/docs/jfrog-security-advisories","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42018","tags":["US Government Resource"]},{"url":"https://www.wiz.io/blog/artifactory-under-attack-in-the-wild-exploitation-of-cve-2026-42016-cve-2026-4201","tags":["Third Party Advisory"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: unauthenticated remote request to public-facing app","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"could return an internal anonymous-user token to an unauthenticated caller","start":18,"end":92}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1528","name":"Steal Application Access Token","tactics":["credential-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: leaks token enabling credential theft","mappingType":"primary_impact","evidence":[{"from":"description","quote":"could return an internal anonymous-user token to an unauthenticated caller","start":18,"end":92}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-57388","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-57388","exploited":true,"exploitedSince":"2026-09-11","provenance":"source"},"exploits":[],"exploitSources":{"nuclei":[{"id":"CVE-2026-42018","name":"JFrog Artifactory - Anonymous Token Disclosure via Trailing Slash Auth Bypass","severity":"high","path":"http/cves/2026/CVE-2026-42018.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-42018.yaml"}],"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1528"],"provenance":"ai"}],"timeline":[{"date":"2026-08-12","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42018","provenance":"source"},{"date":"2026-09-10","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.wiz.io/blog/artifactory-under-attack-in-the-wild-exploitation-of-cve-2026-42016-cve-2026-4201","provenance":"source"},{"date":"2026-09-11","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-09-11","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-57388","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":30},"priority":{"score":77.4,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 51 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.11,"detail":"percentile 0.9554"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 nuclei template"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"35 pulses"},{"name":"CVSS severity","points":5.25,"detail":"base score 7.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-jfrog-artifactory-cwe-287"}}