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Fencer Intel
critical 9.3

CVE-2026-32301 json

Centrifugo: SSRF via unverified JWT claims interpolated into dynamic JWKS endpoint URL

published 7mo ago modified 4mo ago also GHSA-j77h-rr39-c552 , GO-2026-4702 , EUVD-2026-11716

cvss
9.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/centrifugal/centrifugo/v6 6.7.0
  • centrifugal centrifugo 6.7.0
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2

suse advisories SUSE-SU-2026:1135-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
7mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/centrifugal/centrifugo/security/advisories/GHSA-j77h-rr39-c552 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
GitHub 3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/centrifugal/centrifugo/v6
<6.7.0
6.7.0
go github.com/centrifugal/centrifugo
<=2.4.0
all versions
 no fix listed
go github.com/centrifugal/centrifugo/v3
<=3.2.3
all versions
 no fix listed
go github.com/centrifugal/centrifugo/v4
<=4.1.5
all versions
 no fix listed
go github.com/centrifugal/centrifugo/v5
<=5.4.9
all versions
 no fix listed

Affected products

  • centrifugal centrifugo

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.