{"id":"CVE-2026-21531","aliases":["PYSEC-2026-289"],"url":"https://o3.security/vulnerability/CVE-2026-21531","summary":"Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE","details":"Deserialization of untrusted data in the Azure AI Language Conversations Authoring client library for Python allows an unauthorized attacker to execute code over a network.","published":"2026-02-10T18:30:42Z","modified":"2026-06-29T12:26:35.828782941Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"azure-ai-language-conversations-authoring","fixedVersion":"1.0.0b4"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21531"},{"type":"PACKAGE","url":"https://github.com/Azure/azure-sdk-for-python"},{"type":"WEB","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21531"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-06-29T12:26:35.828782941Z"}}