Cross-Site WebSocket Hijacking and Permissive CORS in Google Agent Development Kit (ADK) for Java Development Server
Summary
| CVE | CVE-2026-107858 |
|---|---|
| State | PUBLISHED |
| Assigner | |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-23 06:17:03 UTC |
| Updated | 2026-10-23 06:17:03 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 7.2 HIGH from [email protected]
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-306 | CWE-942 | CWE-1385 | CWE-1385 CWE-1385 Missing Origin Validation in WebSockets | CWE-942 CWE-942 Permissive Cross-domain Policy with Untrusted Domains | CWE-306 CWE-306 Missing Authentication for Critical Function
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 7.2 | HIGH | 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/E:X/C... |
| 4.0 | CNA | CVSS | 7.2 | HIGH | 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 |
CVSS v4.0 Breakdown
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Agent Development Kit ADK For Java | affected 0.1.0 1.13.0 semver | Not specified | |
| CNA | Agent Development Kit ADK For Java | affected 0.3.0 1.13.0 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/google/adk-java/commit/c2b087cbaf44f44d20dc946d8f2391506a2fce3d | [email protected] | github.com | |
| github.com/google/adk-java/pull/1222 | [email protected] | github.com | |
| github.com/google/adk-java/commit/5667d382ab5078a0d6e8f7184713a6bab767e004 | [email protected] | github.com | |
| github.com/google/adk-java/issues/1257 | [email protected] | github.com | |
| github.com/google/adk-java/releases/tag/v1.6.0 | [email protected] | github.com | |
| github.com/google/adk-java/commit/1ae5078072e13e101318e32833f1db323ef084e1 | [email protected] | github.com | |
| github.com/google/adk-java/releases/tag/v1.13.0 | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: George Chen (@geo-chen) (en)
CNA: Gouri Sankar A (@g0w6y) (en)
Additional Advisory Data
Solutions
CNA: Upgrade Google Agent Development Kit (ADK) for Java to version 1.13.0 or later.
Workarounds
CNA: For versions 1.6.0 through 1.12.0, configure the adk.web.cors.origins property to an explicit allowlist of trusted origins (for example, http://localhost:8000) to restrict both the REST API and the /run_live WebSocket endpoint.