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

Quick assessment

Affected
centrifugal centrifugo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

centrifugo是Centrifugal Labs开源的一个实时消息推送服务器。 centrifugo 6.7.0之前版本存在代码问题漏洞，该漏洞源于动态JWKS端点URL配置不当，可能导致未经身份验证的攻击者通过特制JWT触发服务端请求伪造。

CVSS 9.3 · Critical EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-32301

Vulnerability Information
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Vulnerability Title
Centrifugo: SSRF via unverified JWT claims interpolated into dynamic JWKS endpoint URL
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
centrifugo 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
centrifugo是Centrifugal Labs开源的一个实时消息推送服务器。 centrifugo 6.7.0之前版本存在代码问题漏洞，该漏洞源于动态JWKS端点URL配置不当，可能导致未经身份验证的攻击者通过特制JWT触发服务端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
centrifugal centrifugo < 6.7.0 -

II. Public POCs for CVE-2026-32301

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III. Intelligence Information for CVE-2026-32301

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Vendor Advisories for CVE-2026-32301 (1)

IV. Related Vulnerabilities

Same product: centrifugo
Same vendor: centrifugal
Same weakness: CWE-918

V. Comments for CVE-2026-32301

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