CVE-2026-32301
Critical
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.
SeverityCritical
CVSS9.3
Exploit probability—
ProductCentrifugal Centrifugo
PublishedMar 13, 2026
First seenMar 13, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Update
- centrifugal centrifugo6.7.0 or later
- github.com/centrifugal/centrifugo/v66.7.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| centrifugal centrifugo | v < 6.7.0 | 6.7.0 |
| github.com/centrifugal/centrifugo/v6Go | v < 6.7.0 | 6.7.0 |
| github.com/centrifugal/centrifugoGo | v ≤ 2.4.0, No range specified | — |
| github.com/centrifugal/centrifugo/v3Go | v ≤ 3.2.3, No range specified | — |
| github.com/centrifugal/centrifugo/v4Go | v ≤ 4.1.5, No range specified | — |
| github.com/centrifugal/centrifugo/v5Go | v ≤ 5.4.9, No range specified | — |
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