What’s Vulnerable › Vulnerabilities

CVE-2026-49998: Centrifugo: Dynamic JWKS key cache keyed only by `kid` allows cross-issuer JWT authentication bypass

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-16 · updated 2026-10-24
• Weakness: CWE-347

Description

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.

Affected products

• centrifugal centrifugo: before 6.8.1

References

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

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