{"id":"CVE-2026-33865","state":"PUBLISHED","title":"Stored XSS via unsafe YAML parsing in MLflow","description":"MLflow is vulnerable to Stored Cross-Site Scripting (XSS) caused by unsafe parsing of YAML-based MLmodel artifacts in its web interface. An authenticated attacker can upload a malicious MLmodel file containing a payload that executes when another user views the artifact in the UI. This allows actions such as session hijacking or performing operations on behalf of the victim. \n\nThis issue affects MLflow version through 3.10.1","publishedAt":"2026-04-07T12:57:38.525Z","updatedAt":"2026-04-14T15:13:57.547Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","source":"CERT-PL"},"assigner":"CERT-PL","products":["Mlflow Mlflow"],"affected":[{"vendor":"Mlflow","product":"Mlflow","packageName":"mlfolw","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"3.10.1","versionType":"semver"}],"collectionURL":"https://github.com","repo":"https://github.com/mlflow/"}],"references":["https://github.com/mlflow/mlflow/pull/21435","https://cert.pl/en/posts/2026/04/CVE-2026-33865/","https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/33xxx/CVE-2026-33865.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33865","state":"PUBLISHED","datePublished":"2026-04-07T12:57:38.525Z","dateUpdated":"2026-04-14T15:13:57.547Z","assignerShortName":"CERT-PL","assignerOrgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateReserved":"2026-03-24T13:13:32.905Z"},"containers":{"cna":{"title":"Stored XSS via unsafe YAML parsing in MLflow","descriptions":[{"lang":"en","value":"MLflow is vulnerable to Stored Cross-Site Scripting (XSS) caused by unsafe parsing of YAML-based MLmodel artifacts in its web interface. An authenticated attacker can upload a malicious MLmodel file containing a payload that executes when another user views the artifact in the UI. This allows actions such as session hijacking or performing operations on behalf of the victim. \n\nThis issue affects MLflow version through 3.10.1"}],"affected":[{"vendor":"Mlflow","product":"Mlflow","packageName":"mlfolw","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"3.10.1","versionType":"semver"}],"collectionURL":"https://github.com","repo":"https://github.com/mlflow/"}],"references":[{"url":"https://github.com/mlflow/mlflow/pull/21435","tags":["patch"]},{"url":"https://cert.pl/en/posts/2026/04/CVE-2026-33865/","tags":["third-party-advisory"]},{"url":"https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors","tags":["exploit","technical-description"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CERT-PL","orgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateUpdated":"2026-04-09T13:31:08.842Z"},"credits":[{"lang":"en","type":"finder","value":"Sławomir Zakrzewski (AFINE)"}],"impacts":[{"capecId":"CAPEC-592","descriptions":[{"lang":"en","value":"CAPEC-592 Stored XSS"}]}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-14T15:13:51.359371Z","id":"CVE-2026-33865","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-14T15:13:57.547Z"}}]}}}