CVE-2026-90820: Missing Authorization in a2aproject a2a-java
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.
AI Analysis
Technical Summary
The vulnerability CVE-2026-90820 affects a2aproject a2a-java version 1.2.0 specifically in the AuthorizationRequestHandlerDecorator.onListTasks function located in server-common/src/main/java/org/a2aproject/sdk/server/requesthandlers/AuthorizationRequestHandlerDecorator.java. This flaw results in missing authorization controls, enabling remote attackers to perform unauthorized actions. The issue is fixed by upgrading to version 1.3.0, with the patch identified by commit e9a1abf9c90c02b16d17293afdc3cc2f555d63a6.
Potential Impact
The vulnerability allows remote attackers to bypass authorization checks in the affected function, potentially leading to unauthorized access or actions within the application. The CVSS 4.0 base score is 5.3 (medium severity), reflecting network attack vector, low complexity, no privileges required, and no user interaction needed.
Mitigation Recommendations
Upgrade the affected component a2a-java from version 1.2.0 to version 1.3.0, which contains the official fix for this missing authorization vulnerability. No additional mitigation steps are indicated.
CVE-2026-90820: Missing Authorization in a2aproject a2a-java
Description
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.
CVSS v4.0
Score 5.3medium
Affected software
a2aproject
a2a-java
cpe:2.3:a:a2aproject:a2a-java:*:*:*:*:*:*:*:*AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-90820 affects a2aproject a2a-java version 1.2.0 specifically in the AuthorizationRequestHandlerDecorator.onListTasks function located in server-common/src/main/java/org/a2aproject/sdk/server/requesthandlers/AuthorizationRequestHandlerDecorator.java. This flaw results in missing authorization controls, enabling remote attackers to perform unauthorized actions. The issue is fixed by upgrading to version 1.3.0, with the patch identified by commit e9a1abf9c90c02b16d17293afdc3cc2f555d63a6.
Potential Impact
The vulnerability allows remote attackers to bypass authorization checks in the affected function, potentially leading to unauthorized access or actions within the application. The CVSS 4.0 base score is 5.3 (medium severity), reflecting network attack vector, low complexity, no privileges required, and no user interaction needed.
Mitigation Recommendations
Upgrade the affected component a2a-java from version 1.2.0 to version 1.3.0, which contains the official fix for this missing authorization vulnerability. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-09-13T19:01:40.764Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa85d5755bf5e2cf598a1cf
Added to database: 09/14/2026, 20:47:19 UTC
Last enriched: 09/14/2026, 21:03:21 UTC
Last updated: 09/15/2026, 05:01:22 UTC
Views: 4
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