---
title: "CVE-2026-107858: Google Agent Development Kit - CORS Misconfiguration & Missing Origin Validation"
description: "Google Agent Development Kit (ADK) for Java versions < 1.13.0 contain missing origin validation and permissive cross-domain policy in the development web server (ADK Web), caused by unrestricted WebSocket origins and CORS settings, letting remote attackers control local agents and access data via malicious web pages, exploit requires developer to visit malicious page while server is running."
url: https://panop.io/threat-heartbeat/CVE-2026-107858/
---

# CVE-2026-107858 Google Agent Development Kit - CORS Misconfiguration & Missing Origin Validation

Google Agent Development Kit (ADK) for Java versions < 1.13.0 contain missing origin validation and permissive cross-domain policy in the development web server (ADK Web), caused by unrestricted WebSocket origins and CORS settings, letting remote attackers control local agents and access data via malicious web pages, exploit requires developer to visit malicious page while server is running.

CVSS base score 7.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.36% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107858)

## Details

Type

CORS Misconfiguration

Impact

Information Disclosure, Data Tampering

CVSS vector

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

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Update to version 1.13.0 or later which enforces same-origin policy and rejects DNS-rebinding requests.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107858](https://nvd.nist.gov/vuln/detail/CVE-2026-107858)
- [https://github.com/google/adk-java/releases/tag/v1.13.0](https://github.com/google/adk-java/releases/tag/v1.13.0)
- [https://github.com/google/adk-java/releases/tag/v1.6.0](https://github.com/google/adk-java/releases/tag/v1.6.0)
- [https://github.com/google/adk-java/commit/1ae5078072e13e101318e32833f1db323ef084e1](https://github.com/google/adk-java/commit/1ae5078072e13e101318e32833f1db323ef084e1)
- [https://github.com/google/adk-java/commit/5667d382ab5078a0d6e8f7184713a6bab767e004](https://github.com/google/adk-java/commit/5667d382ab5078a0d6e8f7184713a6bab767e004)
- [https://github.com/google/adk-java/commit/c2b087cbaf44f44d20dc946d8f2391506a2fce3d](https://github.com/google/adk-java/commit/c2b087cbaf44f44d20dc946d8f2391506a2fce3d)
- [https://github.com/google/adk-java/issues/1257](https://github.com/google/adk-java/issues/1257)
- [https://github.com/google/adk-java/pull/1222](https://github.com/google/adk-java/pull/1222)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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