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CVE-2026-107858— Cross-Site WebSocket Hijacking and Permissive CORS in Google Agent Development Kit (ADK) for Java Development Server

Quick assessment

Affected
Google Agent Development Kit (ADK) for Java
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.

Google Java 版 Agent 开发套件（ADK）中的开发 Web 服务器（ADK Web）存在 WebSocket 源验证缺失（CWE-1385）以及针对不可信域域的宽松跨域策略（CWE-942）漏洞。受影响版本包括： 0.1.0 至 1.13.0 之前的版本，以及 0.3.0 至 1.13.0 之前的版本。 该漏洞允许远程攻击者利用开发者在服务器运行时访问的恶意网页，控制本地运行的代理（agent）并读取其数据。具体而言： WebSocket 端点默认接受来自任意源的连接：在 0.1.0 至 1.5.0

CVSS 7.2 · High EPSS 0.36% · P29

Affected Version Matrix 2

VendorProduct Version RangeStatus
Google Agent Development Kit (ADK) for Java 0.1.0< 1.13.0 affected
0.3.0< 1.13.0 affected
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I. Basic Information for CVE-2026-107858

Vulnerability Information
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Vulnerability Title
Cross-Site WebSocket Hijacking and Permissive CORS in Google Agent Development Kit (ADK) for Java Development Server
Source: CVE Program / CVE List V5
Vulnerability Description
Missing Origin Validation in WebSockets (CWE-1385) and Permissive Cross-domain Policy with Untrusted Domains (CWE-942) in the development web server (ADK Web) in Google Agent Development Kit (ADK) for Java (com.google.adk:google-adk-dev versions 0.1.0 before 1.13.0 and com.google.adk:google-adk-maven-plugin versions 0.3.0 before 1.13.0) allow a remote attacker to control a locally running agent and read its data via a malicious web page visited by a developer while the server is running. The /run_live WebSocket endpoint accepts connections from any origin by default (hardcoded via setAllowedOrigins("*") in versions 0.1.0 through 1.5.0, and defaulting to * via adk.web.cors.origins in versions 1.6.0 through 1.12.0), and since version 0.4.0 the REST API returns Access-Control-Allow-Origin: * by default. Because the server has no authentication and requests originate from the developer's browser (so binding to localhost does not prevent exploitation), a cross-origin page can send messages to the agent (triggering registered tools), stream agent responses, and list, read, create, or delete sessions and artifacts. In versions 1.6.0 through 1.12.0, users can mitigate the issue by setting the adk.web.cors.origins property to an explicit allowlist of trusted origins (such as http://localhost:8000). The vulnerability is fixed in version 1.13.0, which enforces a same-origin default for CORS and the /run_live WebSocket endpoint, and rejects DNS-rebinding requests over loopback.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1385
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Google Agent Development Kit (ADK) for Java 0.1.0 ~ 1.13.0 -
Google Agent Development Kit (ADK) for Java 0.3.0 ~ 1.13.0 -

II. Public POCs for CVE-2026-107858

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III. Intelligence Information for CVE-2026-107858

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Patches & Fixes for CVE-2026-107858 (4)

Other References for CVE-2026-107858 (1)

IV. Related Vulnerabilities

Same vendor: Google
Same weakness: CWE-1385

V. Comments for CVE-2026-107858

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