CVE-2026-49998GHSA-G6VG-WJ8F-48CJGO-2026-5872
Centrifugo: Dynamic JWKS key cache keyed only by `kid` allows cross-issuer JWT authentication bypass
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.8.1
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: poc
- Automatable: no
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: poc · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- centrifugal centrifugo
fixed in 6.8.1
- github.com/centrifugal/centrifugo/v6Go
fixed in 6.8.1
- github.com/centrifugal/centrifugo/v5Go
through 5.4.9
- github.com/centrifugal/centrifugo/v4Go
through 4.1.5
- github.com/centrifugal/centrifugo/v3Go
through 3.2.3
- github.com/centrifugal/centrifugoGo
through 2.4.0
- github.com/centrifugal/centrifugoGo
All versions
- github.com/centrifugal/centrifugo/v3Go
All versions
- github.com/centrifugal/centrifugo/v4Go
All versions
- github.com/centrifugal/centrifugo/v5Go
All versions