CVE-2026-90820
Published:September 14, 2026
Updated:October 11, 2026
A security vulnerability has been detected in a2aproject a2a-java 1.2.0. The impacted element is the function AuthorizationRequestHandlerDecorator.onListTasks of the file server-common/src/main/java/org/a2aproject/sdk/server/requesthandlers/AuthorizationRequestHandlerDecorator.java. Such manipulation leads to missing authorization. The attack can be launched remotely. Upgrading to version 1.3.0 is sufficient to resolve this issue. The name of the patch is e9a1abf9c90c02b16d17293afdc3cc2f555d63a6. The affected component should be upgraded.
Affected Packages
https://github.com/a2aproject/a2a-java.git (GITHUB):
Affected version(s) >=v1.1.0.Final <v1.3.0.FinalFix Suggestion:
Update to version v1.3.0.Finalorg.a2aproject.sdk:a2a-java-sdk-server-common (JAVA):
Affected version(s) >=1.1.0.Final <1.3.0.FinalFix Suggestion:
Update to version 1.3.0.FinalRelated Resources (10)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
NOT DEFINED
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Exploit Maturity
NOT DEFINED
EPSS
Base Score:
0.39