by Kastro
Paper/Archive/CVE-2026-32301

CVE-2026-32301

centrifugal centrifugo — Centrifugo: SSRF via unverified JWT claims interpolated into dynamic JWKS endpoint URL

EPSS 0.3%public exploitCVSS 9.3
critical.is priorityof 100
42
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 19.0.190 × 203.8Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

Centrifugo is an open-source scalable real-time messaging server. Prior to 6.7.0, Centrifugo is vulnerable to Server-Side Request Forgery (SSRF) when configured with a dynamic JWKS endpoint URL using template variables (e.g. {{tenant}}). An unauthenticated attacker can craft a JWT with a malicious iss or aud claim value that gets interpolated into the JWKS fetch URL before the token signature is verified, causing Centrifugo to make an outbound HTTP request to an attacker-controlled destination. This vulnerability is fixed in 6.7.0.

Affected

ProductAffectedFixed inSource
centrifugo< 6.7.0–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial

References

refgithub.com/centrifugal/centrifugo/security/advisories/GHSA-j77h-rr39-c552