What is CVE-2026-32301?

CVE-2026-32301 is a critical-severity vulnerability in Centrifugal Centrifugo, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.3/10. Published 2026-03-13.

How severe is CVE-2026-32301?

Critical severity. CVSS v3 base score is 9.3 out of 10.

SSRF in Centrifugal Centrifugo

CVE-2026-32301

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.003 (17.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N.

Affected products

Centrifugal Centrifugo — versions < 6.7.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-32301?: CVE-2026-32301 is a critical-severity vulnerability in Centrifugal Centrifugo, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.3/10. Published 2026-03-13.
How severe is CVE-2026-32301?: Critical severity. CVSS v3 base score is 9.3 out of 10.