{"affected":[{"defaultStatus":"unaffected","product":"SAP Cloud SDK for Python","source":"CNA: sap","vendor":"SAP_SE","versions":[{"status":"affected","version":"< 0.63.1"}]}],"cveId":"CVE-2026-109799","cwes":["CWE-347"],"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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.5,"severity":"high","source":"CNA: sap","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}],"modifiedAt":1794272671245,"publishedAt":1794272671245,"references":[{"source":"CNA: sap","tags":[],"url":"https://github.com/SAP/cloud-sdk-python/security/advisories/GHSA-93m8-crj2-v997"},{"source":"CNA: sap","tags":[],"url":"https://url.sap/sapsecuritypatchday"}],"remediation":[],"revision":"7a8d16982b2dd468d3d573de371b0d0afd010516736c6728fcde4972c8ef28f6","sources":[{"modifiedAt":1794272671245,"name":"CNA: sap","retrievedAt":1794276501723,"url":"https://www.cve.org/CVERecord?id=CVE-2026-109799"}],"ssvc":null,"status":"published","title":"Improper verification of JWT signature in IASContextProvider leads to tenant/user identity spoofing ( sap-cloud-sdk (pip))","updatedAt":1794276501723}