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  4. CVE 2026 109799 improper verification of jwt signature in
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Back to active CVEs
High · CVSS 7.5CVE-2026-109799

Improper verification of JWT signature in IASContextProvider leads to tenant/user identity spoofing ( sap-cloud-sdk (pip))CVE-2026-109799

Answer in brief

CVE-2026-109799 records a High severity (CVSS 7.5) vulnerability in Improper verification of JWT signature in IASContextProvider leads to tenant/user identity spoofing ( sap-cloud-sdk (pip)). The current sources do not mark it as known exploited. The current feed maps SAP_SE/SAP Cloud SDK for Python (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 10, 2026Updated Nov 10, 2026Source checked Nov 10, 2026First seen by HOL Nov 10, 2026Material review Nov 10, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps SAP_SE/SAP Cloud SDK for Python (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
SAP_SE/SAP Cloud SDK for Pythongeneric<0.63.10.63.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for SAP_SE/SAP Cloud SDK for Python.
  2. 2Review the reported fix. Update SAP_SE/SAP Cloud SDK for Python to 0.63.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 10, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referenceurl.sap
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Missing Authentication in SAP NetWeaver AS ABAP and ABAP Platform (SAML2 Service Provider)Also CWE-347

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-347
Source
CVE List V5
Source checked
Nov 10, 2026
References
2 linked sources
Open source record