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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 8
https://github.com/a2aproject/a2a-java/
cna@vuldb.com
https://github.com/a2aproject/a2a-java/commit/e9a1abf9c90c02b16d17293afdc3cc2f5…
cna@vuldb.com
https://github.com/a2aproject/a2a-java/pull/1038
cna@vuldb.com
https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final
cna@vuldb.com
https://vuldb.com/cve/CVE-2026-90820
cna@vuldb.com
https://vuldb.com/submit/925152
cna@vuldb.com
https://vuldb.com/vuln/403323
cna@vuldb.com
https://vuldb.com/vuln/403323/cti
cna@vuldb.com