{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-109799", "assignerOrgId": "e4686d1a-f260-4930-ac4c-2f5c992778dd", "state": "PUBLISHED", "assignerShortName": "sap", "dateReserved": "2026-10-13T03:47:41.535Z", "datePublished": "2026-11-10T01:04:31.245Z", "dateUpdated": "2026-11-10T19:38:57.265Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "e4686d1a-f260-4930-ac4c-2f5c992778dd", "shortName": "sap", "dateUpdated": "2026-11-10T01:04:31.245Z"}, "title": "Improper verification of JWT signature in IASContextProvider leads to tenant/user identity spoofing ( sap-cloud-sdk (pip))", "problemTypes": [{"descriptions": [{"lang": "eng", "cweId": "CWE-347", "description": "CWE-347: Improper Verification of Cryptographic Signature", "type": "CWE"}]}], "affected": [{"vendor": "SAP_SE", "product": "SAP Cloud SDK for Python", "versions": [{"status": "affected", "version": "< 0.63.1"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "The SAP Cloud SDK for Python contains an improper cryptographic signature verification vulnerability (CWE-347) in IASContextProvider, the runtime-context provider registered by default via bootstrap(app).IASContextProvider extracted the app_tid, sap_gtid and user_uuid claims from the IAS JWT in the Authorization header using an unverified decoder and wrote them into the request-scoped RuntimeContext without validating the token signature. A remote caller could submit a self-signed JWT naming a victim tenant/user; the forged identity then propagated to every consumer of the runtime context:OTel span attributes (sap.tenancy.tenant_id, user.id) via RuntimeContextSpanProcessorlog records via IdentityLogFilteraudit events (tenant_id, user_initiator_id) via AuditClienttenant routing via CBCClientThis completes an earlier remediation that fixed the same unverified pattern in StarletteIASTelemetryMiddleware but did not cover IASContextProvider.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The SAP Cloud SDK for Python contains an improper cryptographic signature verification vulnerability (CWE-347) in IASContextProvider, the runtime-context provider registered by default via bootstrap(app).IASContextProvider extracted the app_tid, sap_gtid and user_uuid claims from the IAS JWT in the Authorization header using an unverified decoder and wrote them into the request-scoped RuntimeContext without validating the token signature. A remote caller could submit a self-signed JWT naming a victim tenant/user; the forged identity then propagated to every consumer of the runtime context:OTel span attributes (sap.tenancy.tenant_id, user.id) via RuntimeContextSpanProcessorlog records via IdentityLogFilteraudit events (tenant_id, user_initiator_id) via AuditClienttenant routing via CBCClientThis completes an earlier remediation that fixed the same unverified pattern in StarletteIASTelemetryMiddleware but did not cover IASContextProvider.</p>"}]}], "references": [{"url": "https://github.com/SAP/cloud-sdk-python/security/advisories/GHSA-93m8-crj2-v997"}, {"url": "https://url.sap/sapsecuritypatchday"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-11-10T19:38:40.745448Z", "id": "CVE-2026-109799", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-10T19:38:57.265Z"}}]}}

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