{"schemaVersion":3,"id":"CVE-2026-2635","aliases":["GHSA-gq3w-7jj3-x7gr","PYSEC-2026-421"],"status":"published","duplicateOf":null,"title":null,"description":"MLflow Use of Default Password Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of MLflow. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the basic_auth.ini file. The file contains hard-coded default credentials. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of the administrator. Was ZDI-CAN-28256.","dates":{"published":"2026-02-20T22:25:03.494Z","modified":"2026-07-15T01:14:56.961Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.0","versionLabel":"v3.0","source":"CVE.org","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.3,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":9.8,"severity":"critical","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Pypi","score":9.8,"severity":"critical","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.3,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01358,"percentile":0.7129,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.37300000000000005,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00985},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00968,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00968,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00968,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00968,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00968,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00985,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00985,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00985,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00985,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00985,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01358,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01358,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01358,"percentile":0.7129}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00985,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00985,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00985,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00985,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01215,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01242,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01358,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01358,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01358,"percentile":0.7129}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-1393","name":"Use of Default Password","description":"The product uses default passwords for potentially critical functionality.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/1393.html"},{"id":"CWE-798","name":"Use of Hard-coded Credentials","description":"The product contains hard-coded credentials, such as a password or cryptographic key.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/798.html"}],"affected":[{"vendor":"mlflow","product":"mlflow","name":"MLflow","label":"mlflow","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"3.4.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"3.4.0","eol":null,"hubHref":"/vendor/mlflow/mlflow"},{"vendor":"PyPI","product":"mlflow","name":"mlflow","label":"mlflow","ecosystem":"PyPI","cpePart":null,"purl":"pkg:pypi/mlflow","purlType":"pypi","versions":[{"text":"< 3.8.0rc0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.8.0rc0","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-26-111/","label":"www.zerodayinitiative.com/advisories/ZDI-26-111/","hostname":"www.zerodayinitiative.com","tags":["X Research Advisory"]},{"url":"https://github.com/mlflow/mlflow/pull/19260","label":"github.com/mlflow/mlflow/pull/19260","hostname":"github.com","tags":["Vendor Advisory","WEB"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-2635","label":"access.redhat.com/security/cve/CVE-2026-2635","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2441514","label":"bugzilla.redhat.com/show_bug.cgi?id=2441514","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2635.json","label":"security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2635.json","hostname":"security.access.redhat.com","tags":["X Sadp Csaf Vex"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2635","label":"nvd.nist.gov/vuln/detail/CVE-2026-2635","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/mlflow/mlflow/commit/5bf2ec2bd4222a18d78631183ac7f6b752afe8a4","label":"github.com/mlflow/mlflow/commit/5bf2ec2bd4222a18d78631183ac7f6b752afe8a4","hostname":"github.com","tags":["WEB"]},{"url":"https://github.com/mlflow/mlflow","label":"github.com/mlflow/mlflow","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://github.com/mlflow/mlflow/releases/tag/v3.8.0rc0","label":"github.com/mlflow/mlflow/releases/tag/v3.8.0rc0","hostname":"github.com","tags":["WEB"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-26-111","label":"www.zerodayinitiative.com/advisories/ZDI-26-111","hostname":"www.zerodayinitiative.com","tags":["WEB"]},{"url":"https://pypi.org/project/mlflow","label":"pypi.org/project/mlflow","hostname":"pypi.org","tags":["PACKAGE"]},{"url":"https://github.com/advisories/GHSA-gq3w-7jj3-x7gr","label":"github.com/advisories/GHSA-gq3w-7jj3-x7gr","hostname":"github.com","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-02-20T22:25:03.494Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-15T01:14:56.961Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T13:37:17.789Z","stale":false,"partial":false}}