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 ↗

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

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

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