{"id":"CVE-2026-109799","state":"PUBLISHED","title":"Improper verification of JWT signature in IASContextProvider leads to tenant/user identity spoofing ( sap-cloud-sdk (pip))","description":"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.","publishedAt":"2026-11-10T01:04:31.245Z","updatedAt":"2026-11-10T01:04:31.245Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","source":"sap"},"assigner":"sap","products":["SAP_SE SAP Cloud SDK for Python"],"affected":[{"vendor":"SAP_SE","product":"SAP Cloud SDK for Python","defaultStatus":"unaffected","versions":[{"version":"< 0.63.1","status":"affected"}]}],"references":["https://github.com/SAP/cloud-sdk-python/security/advisories/GHSA-93m8-crj2-v997","https://url.sap/sapsecuritypatchday"],"weaknesses":["CWE-347"],"ingestedAt":"2026-11-10T01:16:05.471Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/109xxx/CVE-2026-109799.json","commit":"e10da37d505d5e4e8875928ddfb25482721a8fa0","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-109799","state":"PUBLISHED","datePublished":"2026-11-10T01:04:31.245Z","dateUpdated":"2026-11-10T01:04:31.245Z","assignerShortName":"sap","assignerOrgId":"e4686d1a-f260-4930-ac4c-2f5c992778dd","dateReserved":"2026-10-13T03:47:41.535Z"},"containers":{"cna":{"title":"Improper verification of JWT signature in IASContextProvider leads to tenant/user identity spoofing ( sap-cloud-sdk (pip))","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."}],"affected":[{"vendor":"SAP_SE","product":"SAP Cloud SDK for Python","defaultStatus":"unaffected","versions":[{"version":"< 0.63.1","status":"affected"}]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","lang":"eng","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"sap","orgId":"e4686d1a-f260-4930-ac4c-2f5c992778dd","dateUpdated":"2026-11-10T01:04:31.245Z"},"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}}}}}