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CVE-2026-49998— Centrifugo: Dynamic JWKS key cache keyed only by `kid` allows cross-issuer JWT authentication bypass

CVSS 8.2 · High EPSS 0.18% · P8

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
centrifugalcentrifugo< 6.8.1affected
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I. Basic Information for CVE-2026-49998

Vulnerability Information
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Vulnerability Title
Centrifugo: Dynamic JWKS key cache keyed only by `kid` allows cross-issuer JWT authentication bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Centrifugo is an open-source scalable real-time messaging server. Prior to 6.8.1, Centrifugo dynamic JWKS endpoint verification could reuse a key for one allowed issuer to verify a JWT for another allowed issuer because the JWKS cache and singleflight lookup were keyed only by JWT header kid, not by the resolved JWKS endpoint, issuer, audience, or trust-domain namespace, affecting client.token.jwks_public_endpoint, client.subscription_token.jwks_public_endpoint, internal/jwks/cache.go, and internal/jwks/manager.go. This issue is fixed in version 6.8.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Centrifugal Labs Centrifugo 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
centrifugal centrifugo是centrifugal个人开发者开源的一个实时消息服务器。 Centrifugal Labs Centrifugo 6.8.1之前版本存在加密问题漏洞，该漏洞源于JWKS缓存和singleflight查找仅由JWT header kid键控，而未由解析的JWKS端点、issuer、audience或trust-domain命名空间键控，导致一个允许issuer的密钥可能被重用于验证另一个允许issuer的JWT。
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)

Affected Products

VendorProductAffected VersionsCPESubscribe
centrifugalcentrifugo < 6.8.1 -

II. Public POCs for CVE-2026-49998

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8604 chars
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III. Intelligence Information for CVE-2026-49998

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Patches & Fixes for CVE-2026-49998 (2)

Vendor Advisories for CVE-2026-49998 (1)

Vendor Pages for CVE-2026-49998 (1)

IV. Related Vulnerabilities

Same product: centrifugo
Same vendor: centrifugal
Same weakness: CWE-347

V. Comments for CVE-2026-49998

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