CVE-2026-49998
HIGHCentrifugo: Dynamic JWKS key cache keyed only by `kid` allows cross-issuer JWT authentication bypass
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/centrifugal/centrifugo/releases/tag/v6.8.1
X_Refsource_Confirm x_refsource_confirm
https://github.com/centrifugal/centrifugo/security/advisories/GHSA-g6vg-wj8f-48cj
X_Refsource_Misc x_refsource_misc
https://github.com/centrifugal/centrifugo/pull/1142
X_Refsource_Misc x_refsource_misc
https://github.com/centrifugal/centrifugo/commit/15d785015c6f318c1b68ea40b813699c9f8bd2c4
Scores
CVSS v3
8.2
EPSS
0.0018
EPSS Percentile
7.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-347
Status
published
Products (1)
centrifugal/centrifugo
< 6.8.1
Published
Jul 16, 2026
Tracked Since
Jul 17, 2026