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Vulnerability · Published Sep 16, 2026 · Assigned by Kong

CVE-2026-14916Kong API Gateway Enterprise: JWT Algorithm-Confusion

High 7.7

In plain English

A high-severity security flaw in Kong Enteprise Gateway from Kong. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 4.0)7.7High
Exploit odds (30 days)0.7%top 46.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
Kong Kong Enteprise Gateway 3.15.0.0 – before 3.15.0.33.14.0.0 – before 3.14.0.123.13.0.0 – before 3.13.0.93.12.0.0 – before 3.12.0.103.10.0.0 – before 3.10.0.173.4.0.0 – before 3.4.3.29

Weakness: CWE-241 · 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

References