Vulnerability · Published Mar 12, 2026 · Assigned by GitHub_M
CVE-2026-32301Centrifugo: SSRF via unverified JWT claims interpolated into dynamic JWKS endpoint URL
Critical 9.3
In plain English
A critical-severity server-side request forgery in centrifugo from centrifugal. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/centrifugal/centrifugo | no fix listed | GHSA-j77h-rr39-c552 |
| Go | github.com/centrifugal/centrifugo | no fix listed | GO-2026-4702 |
| Go | github.com/centrifugal/centrifugo/v3 | no fix listed | GO-2026-4702 |
| Go | github.com/centrifugal/centrifugo/v3 | no fix listed | GHSA-j77h-rr39-c552 |
| Go | github.com/centrifugal/centrifugo/v4 | no fix listed | GO-2026-4702 |
| Go | github.com/centrifugal/centrifugo/v4 | no fix listed | GHSA-j77h-rr39-c552 |
| Go | github.com/centrifugal/centrifugo/v5 | no fix listed | GHSA-j77h-rr39-c552 |
| Go | github.com/centrifugal/centrifugo/v5 | no fix listed | GO-2026-4702 |
| Go | github.com/centrifugal/centrifugo/v6 | 6.7.0 | GO-2026-4702 |
| Go | github.com/centrifugal/centrifugo/v6 | 6.7.0 | GHSA-j77h-rr39-c552 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| centrifugal | centrifugo | < 6.7.0 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N