High 7.2Published Oct 23, 2026

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

Updated under an hour ago (Oct 28, 2026, 9:40 AM ET)

Does this affect you?

It affects Google Agent Development Kit (ADK) for Java. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.36%, higher than 30% of scored CVEs.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Google Agent Development Kit (ADK) for Java

Exploited in the last 30 days

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.

CVSS: 7.2 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-1385, CWE-942, CWE-306
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.36% (percentile 30)
Assigned by: Google
NVD analysis: Awaiting Analysis
Record last updated: Oct 23, 2026
First seen by InfoSec Signals: Oct 23, 2026

Affected products

Affected products

Google Agent Development Kit (ADK) for Java google:agent_development_kit_adk_for_java (from the name)	from 0.1.0 before 1.13.0	CNA record

References

References

https://github.com/google/adk-java/issues/1257	issue-tracking, exploit
https://github.com/google/adk-java/releases/tag/v1.13.0	release-notes
https://github.com/google/adk-java/commit/5667d382ab5078a0d6e8f7184713a6bab767e004	patch
https://github.com/google/adk-java/commit/1ae5078072e13e101318e32833f1db323ef084e1	patch
https://github.com/google/adk-java/pull/1222	mitigation, patch
https://github.com/google/adk-java/commit/c2b087cbaf44f44d20dc946d8f2391506a2fce3d	mitigation, patch
https://github.com/google/adk-java/releases/tag/v1.6.0	release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.