CVE-2026-32301 CRITICAL

CVE-2026-32301: Centrifugo: SSRF via unverified JWT claims interpolated into dynamic JWKS endpoint URL

Vendor Centrifugal
Product centrifugo
Weakness CWE-918 · SSRF
Published March 12, 2026
Last update March 13, 2026
View on NVD All CVEs

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 12, 2026 CVE published
March 13, 2026 Record updated