What’s Vulnerable › Vulnerabilities
CVE-2026-32301: Centrifugo: SSRF via unverified JWT claims interpolated into dynamic JWKS endpoint URL
- Severity: critical (CVSS 9.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-13 · updated 2026-06-17
- Weakness: CWE-918
Description
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 products
- centrifugal centrifugo: before 6.7.0 — fixed in 6.7.0
How to fix
Upgrade to a fixed version: centrifugal centrifugo 6.7.0. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-32301 or the next vulnerability affects your stack