{"id":"CVE-2026-44503","state":"PUBLISHED","title":"Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host redirect","description":"The RedirectHandler middleware in microsoft/kiota-java (com.microsoft.kiota:microsoft-kiota-http-okHttp v1.9.0) and other Kiota libraries fails to strip sensitive HTTP headers when following 3xx redirects to a different host or scheme. Only the Authorization header is removed; Cookie, Proxy-Authorization, and all custom headers are forwarded to the redirect target.","publishedAt":"2026-05-14T15:58:57.772Z","updatedAt":"2026-05-14T19:51:10.682Z","severity":{"score":7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["microsoft kiota-java","microsoft Microsoft.Kiota.Abstractions","microsoft github.com/microsoft/kiota-http-go","microsoft kiota-typescript","microsoft microsoft-kiota-abstractions","microsoft microsoft-kiota-http"],"affected":[{"vendor":"microsoft","product":"kiota-java","versions":[{"version":"< 1.9.1","status":"affected"}]},{"vendor":"microsoft","product":"Microsoft.Kiota.Abstractions","versions":[{"version":"< 1.22.0","status":"affected"}]},{"vendor":"microsoft","product":"github.com/microsoft/kiota-http-go","versions":[{"version":"< 1.5.5","status":"affected"}]},{"vendor":"microsoft","product":"kiota-typescript","versions":[{"version":"< 1.0.0-preview.100","status":"affected"}]},{"vendor":"microsoft","product":"microsoft-kiota-abstractions","versions":[{"version":"< 1.9.1","status":"affected"}]},{"vendor":"microsoft","product":"microsoft-kiota-http","versions":[{"version":"< 1.9.9","status":"affected"}]}],"references":["https://github.com/microsoft/kiota-java/security/advisories/GHSA-7j59-v9qr-6fq9"],"weaknesses":["CWE-601"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/44xxx/CVE-2026-44503.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-44503","state":"PUBLISHED","datePublished":"2026-05-14T15:58:57.772Z","dateUpdated":"2026-05-14T19:51:10.682Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-06T18:28:20.886Z"},"containers":{"cna":{"title":"Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host redirect","descriptions":[{"lang":"en","value":"The RedirectHandler middleware in microsoft/kiota-java (com.microsoft.kiota:microsoft-kiota-http-okHttp v1.9.0) and other Kiota libraries fails to strip sensitive HTTP headers when following 3xx redirects to a different host or scheme. Only the Authorization header is removed; Cookie, Proxy-Authorization, and all custom headers are forwarded to the redirect target."}],"affected":[{"vendor":"microsoft","product":"kiota-java","versions":[{"version":"< 1.9.1","status":"affected"}]},{"vendor":"microsoft","product":"Microsoft.Kiota.Abstractions","versions":[{"version":"< 1.22.0","status":"affected"}]},{"vendor":"microsoft","product":"github.com/microsoft/kiota-http-go","versions":[{"version":"< 1.5.5","status":"affected"}]},{"vendor":"microsoft","product":"kiota-typescript","versions":[{"version":"< 1.0.0-preview.100","status":"affected"}]},{"vendor":"microsoft","product":"microsoft-kiota-abstractions","versions":[{"version":"< 1.9.1","status":"affected"}]},{"vendor":"microsoft","product":"microsoft-kiota-http","versions":[{"version":"< 1.9.9","status":"affected"}]}],"references":[{"url":"https://github.com/microsoft/kiota-java/security/advisories/GHSA-7j59-v9qr-6fq9","name":"https://github.com/microsoft/kiota-java/security/advisories/GHSA-7j59-v9qr-6fq9","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-601","lang":"en","description":"CWE-601: URL Redirection to Untrusted Site ('Open Redirect')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-14T15:58:57.772Z"},"source":{"advisory":"GHSA-7j59-v9qr-6fq9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/microsoft/kiota-java/security/advisories/GHSA-7j59-v9qr-6fq9","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-14T18:02:08.790490Z","id":"CVE-2026-44503","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":"2026-05-14T19:51:10.682Z"}}]}}}