{"answers":{"affected":"12 open source packages ship an affected version, including Microsoft.Kiota.Abstractions, github.com/microsoft/kiota-http-go and com.microsoft.kiota:microsoft-kiota-abstractions.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44503 exists.","fix":"Upgrade Microsoft.Kiota.Abstractions to 1.22.0 or later.","what":"CVE-2026-44503 is a high-severity vulnerability in Microsoft.Kiota.Abstractions, published on 14 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-44503 and fix it if it is affected.\n\nWhat it is: CVE-2026-44503 is a high-severity vulnerability in Microsoft.Kiota.Abstractions, published on 14 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44503 exists.\n\nAffected packages and fixed versions:\n- Microsoft.Kiota.Abstractions (NuGet): affected all versions; fixed in 1.22.0\n- Microsoft.Kiota.Abstractions (NuGet): affected all versions; fixed in 1.22.0\n- github.com/microsoft/kiota-http-go (Go): affected all versions; fixed in 1.5.5\n- github.com/microsoft/kiota-http-go (Go): affected all versions; fixed in 1.5.5\n- github.com/microsoft/kiota-http-go (Go): affected all versions; fixed in 1.5.5\n- com.microsoft.kiota:microsoft-kiota-abstractions (Maven): affected all versions; fixed in 1.9.1\n- com.microsoft.kiota:microsoft-kiota-abstractions (Maven): affected all versions; fixed in 1.9.1\n- microsoft-kiota-http (PyPI): affected all versions; fixed in 1.9.9\n- microsoft-kiota-http (PyPI): affected all versions; fixed in 1.9.9\n- microsoft-kiota-http (PyPI): affected all versions; fixed in 1.9.9\n- kiota-typescript (npm): affected all versions; fixed in 1.0.0-preview.100\n- kiota-typescript (npm): affected all versions; fixed in 1.0.0-preview.100\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-44503/ (Markdown: https://insights.sbomify.com/CVE-2026-44503/index.md)","id":"CVE-2026-44503","markdown":"https://insights.sbomify.com/CVE-2026-44503/index.md","name":"CVE-2026-44503","record":{"aliases":["CLEANSTART-2026-DB48135","CLEANSTART-2026-VZ99865","ECHO-0e0d-c481-2581","GHSA-7j59-v9qr-6fq9","GO-2026-5224","MINI-56g5-7v32-5c2q","MINI-6pfv-4q29-xmqm","MINI-85f8-245x-cmcg","MINI-9frx-jg92-9jqf","MINI-jqw7-rhh8-pr3w","MINI-m6gm-rm3v-4gf2","MINI-m767-3wgj-99f3","MINI-pj7h-r3jh-m3p3","MINI-pw6f-r49g-m44x","MINI-px4c-q9j6-hvg5","MINI-q6hc-7m7f-xp2g","MINI-qjwp-2whr-7755","MINI-w5g5-qc9c-7h5c","MINI-x6q5-vxv7-8v2h","PYSEC-2026-2647"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Kiota HTTP client library","requires_auth":"none","summary":"The Kiota HTTP client libraries leak sensitive Cookie and Proxy-Authorization headers to external hosts during cross-host redirects, exposing user credentials.","user_interaction":"required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7,"severity":"high","source":"cna","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","version":"4.0"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"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.","ecosystems":["Go","Maven","NuGet","PyPI","npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host redirect","id":"CVE-2026-44503","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"information_disclosure","year":"2026"},"n_packages":12,"n_references":1,"next":{"headline":"Aegra: Cross-user run injection in /threads/{thread_id}/runs (IDOR)","id":"CVE-2026-44504"},"packages":[{"ecosystem":"Go","fixed":["1.5.5"],"introduced":["0"],"last_affected":[],"package":"github.com/microsoft/kiota-http-go","purl":null,"source":"GHSA-7j59-v9qr-6fq9"},{"ecosystem":"Go","fixed":["1.5.5"],"introduced":["0"],"last_affected":[],"package":"github.com/microsoft/kiota-http-go","purl":"pkg:golang/github.com/microsoft/kiota-http-go","source":"GHSA-7j59-v9qr-6fq9"},{"ecosystem":"Go","fixed":["1.5.5"],"introduced":["0"],"last_affected":[],"package":"github.com/microsoft/kiota-http-go","purl":"pkg:golang/github.com/microsoft/kiota-http-go","source":"GO-2026-5224"},{"ecosystem":"Maven","fixed":["1.9.1"],"introduced":["0"],"last_affected":[],"package":"com.microsoft.kiota:microsoft-kiota-abstractions","purl":null,"source":"GHSA-7j59-v9qr-6fq9"},{"ecosystem":"Maven","fixed":["1.9.1"],"introduced":["0"],"last_affected":[],"package":"com.microsoft.kiota:microsoft-kiota-abstractions","purl":"pkg:maven/com.microsoft.kiota/microsoft-kiota-abstractions","source":"GHSA-7j59-v9qr-6fq9"},{"ecosystem":"NuGet","fixed":["1.22.0"],"introduced":["0"],"last_affected":[],"package":"Microsoft.Kiota.Abstractions","purl":null,"source":"GHSA-7j59-v9qr-6fq9"},{"ecosystem":"NuGet","fixed":["1.22.0"],"introduced":["0"],"last_affected":[],"package":"Microsoft.Kiota.Abstractions","purl":"pkg:nuget/Microsoft.Kiota.Abstractions","source":"GHSA-7j59-v9qr-6fq9"},{"ecosystem":"PyPI","fixed":["1.9.9"],"introduced":["0"],"last_affected":[],"package":"microsoft-kiota-http","purl":null,"source":"GHSA-7j59-v9qr-6fq9"},{"ecosystem":"PyPI","fixed":["1.9.9"],"introduced":["0"],"last_affected":[],"package":"microsoft-kiota-http","purl":"pkg:pypi/microsoft-kiota-http","source":"GHSA-7j59-v9qr-6fq9"},{"ecosystem":"PyPI","fixed":["1.9.9"],"introduced":["0"],"last_affected":[],"package":"microsoft-kiota-http","purl":"pkg:pypi/microsoft-kiota-http","source":"PYSEC-2026-2647"},{"ecosystem":"npm","fixed":["1.0.0-preview.100"],"introduced":["0"],"last_affected":[],"package":"kiota-typescript","purl":null,"source":"GHSA-7j59-v9qr-6fq9"},{"ecosystem":"npm","fixed":["1.0.0-preview.100"],"introduced":["0"],"last_affected":[],"package":"kiota-typescript","purl":"pkg:npm/kiota-typescript","source":"GHSA-7j59-v9qr-6fq9"}],"prev":{"headline":"Bugsink: SSRF bypass in `validate_webhook_url`","id":"CVE-2026-44502"},"products":["Microsoft.Kiota.Abstractions","github.com/microsoft/kiota-http-go","kiota-java","kiota-typescript","microsoft-kiota-abstractions","microsoft-kiota-http"],"published":"2026-05-14","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-14","vendors":["microsoft"]},"summary":"The Kiota HTTP client libraries leak sensitive Cookie and Proxy-Authorization headers to external hosts during cross-host redirects, exposing user credentials.","url":"https://insights.sbomify.com/CVE-2026-44503/"}