A JWT signature verification vulnerability affects Kong components that perform JWT validation for MCP OAuth2 or DataKit integrations inside Kong API Gateway Enterprise. The affected code does not properly validate that the JWT signing algorithm is compatible with the type of key used for verification.



As a result, an unauthenticated remote attacker may be able to craft a forged JWT that is incorrectly accepted as valid, leading to authentication bypass and potential compromise of confidentiality, integrity, and availability.
Advisories

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Fixes

Solution

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Workaround

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History

Wed, 16 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 16 Sep 2026 10:30:00 +0000

Type Values Removed Values Added
Description A JWT signature verification vulnerability affects Kong components that perform JWT validation for MCP OAuth2 or DataKit integrations inside Kong API Gateway Enterprise. The affected code does not properly validate that the JWT signing algorithm is compatible with the type of key used for verification. As a result, an unauthenticated remote attacker may be able to craft a forged JWT that is incorrectly accepted as valid, leading to authentication bypass and potential compromise of confidentiality, integrity, and availability.
Title Kong API Gateway Enterprise: JWT Algorithm-Confusion
Weaknesses CWE-241
References
Metrics cvssV4_0

{'score': 7.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Kong

Published:

Updated: 2026-09-16T13:26:46.569Z

Reserved: 2026-07-07T07:14:53.612Z

Link: CVE-2026-14916

cve-icon Vulnrichment

Updated: 2026-09-16T13:26:43.516Z

cve-icon NVD

Status : Received

Published: 2026-09-16T11:16:40.503

Modified: 2026-09-16T14:17:03.563

Link: CVE-2026-14916

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses