CVE-2026-49998

HIGH 8.2

Centrifugo: Dynamic JWKS key cache keyed only by `kid` allows cross-issuer JWT authentication bypass

CVSS Score

8.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-347
Vendor	centrifugal
Product	centrifugo
Published	Jul 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

centrifugal / centrifugo

< 6.8.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/centrifugal/centrifugo/security/advisories/GHSA-g6vg-wj8f-48cj github.com: https://github.com/centrifugal/centrifugo/pull/1142 github.com: https://github.com/centrifugal/centrifugo/commit/15d785015c6f318c1b68ea40b813699c9f8bd2c4 github.com: https://github.com/centrifugal/centrifugo/releases/tag/v6.8.1