{"id":"CVE-2026-21531","aliases":["GHSA-436v-jg82-p533","PYSEC-2026-289"],"title":"Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE","summary":"Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"azure-ai-language-conversations-authoring","product":"azure-ai-language-conversations-authoring","ecosystem":"pip","affected":["azure-ai-language-conversations-authoring < 1.0.0b4"],"patched":["azure-ai-language-conversations-authoring 1.0.0b4"],"published":"2026-02-10","updated":"2026-10-27","sourceUpdated":"2026-10-27T15:30:04.364585856Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-436v-jg82-p533","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21531"},{"url":"https://github.com/Azure/azure-sdk-for-python"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/azure-ai-language-conversations-authoring/PYSEC-2026-289.yaml"},{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21531"},{"url":"https://pypi.org/project/azure-ai-language-conversations-authoring"},{"url":"https://github.com/advisories/GHSA-436v-jg82-p533"}],"tags":["osv","pip","exploit-available","ghsa"],"epss":0.0258,"epssPercentile":0.85137,"exploits":{"github":1,"githubRepos":["https://github.com/NetVanguard-cmd/CVE-2026-21531"],"checkedAt":"2026-10-27T16:20:47.575Z"},"exploitAvailable":true,"cwe":["CWE-502"],"ingestedAt":"2026-10-27T16:11:58.724Z","slug":"CVE-2026-21531","body":"## Overview\n\nDeserialization of untrusted data in the Azure AI Language Conversations Authoring client library for Python allows an unauthorized attacker to execute code over a network.\n\n## Affected packages\n\n- `azure-ai-language-conversations-authoring < 1.0.0b4`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `azure-ai-language-conversations-authoring 1.0.0b4`","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.5,"exploitation":12,"ransomware":0},"changes":[]}