centrifugal centrifugo up to 6.8.0 JWKS Endpoint internal/jwks/cache.go improper authentication

Summaryinfo

A vulnerability was found in centrifugal centrifugo up to 6.8.0. It has been declared as critical. This impacts an unknown function of the file internal/jwks/cache.go of the component JWKS Endpoint. Executing a manipulation can lead to improper authentication. This vulnerability is registered as CVE-2026-49998. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in centrifugal centrifugo up to 6.8.0. This vulnerability affects some unknown processing of the file internal/jwks/cache.go of the component JWKS Endpoint. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Centrifugo is an open-source scalable real-time messaging server. Prior to 6.8.1, Centrifugo dynamic JWKS endpoint verification could reuse a key for one allowed issuer to verify a JWT for another allowed issuer because the JWKS cache and singleflight lookup were keyed only by JWT header kid, not by the resolved JWKS endpoint, issuer, audience, or trust-domain namespace, affecting client.token.jwks_public_endpoint, client.subscription_token.jwks_public_endpoint, internal/jwks/cache.go, and internal/jwks/manager.go. This issue is fixed in version 6.8.1.

The advisory is available at github.com. This vulnerability was named CVE-2026-49998 since 06/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 6.8.1 eliminates this vulnerability.

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Productinfo

Vendor

• centrifugal

Name

• centrifugo

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8.0

Website

• Product: https://github.com/centrifugal/centrifugo/

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