9.3

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

Analyzed
AliasesGHSA-j77h-rr39-c552GO-2026-4702
Published 12-03-2026Last modified 13-03-2026

Vulnerability summary

CVE-2026-32301 is a critical (CVSS 9.3) Server-Side Request Forgery vulnerability in centrifugal centrifugo. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 19% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (GitHub, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
9.3/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.27%
0%100%
Low · -0.09 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:1135-1

Timeline

  1. 12-03-2026
    PublishedVulnerability first disclosed.
  2. 13-03-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

Decrease -0.09 pp

From 0.36% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Centrifugo

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Github.com/centrifugal/centrifugo4 products
  • v3≤ 3.2.3 | All versions (No fix recorded)
  • v4≤ 4.1.5 | All versions (No fix recorded)
  • v5≤ 5.4.9 | All versions (No fix recorded)
  • v6< 6.7.0
Centrifugal1 product
Github.com/centrifugal1 product
  • centrifugo≤ 2.4.0 | All versions (No fix recorded)

3 vendors · 6 products

References

4 links