CVE-2026-90820

Medium

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductA2aproject A2a-java

PublishedSep 14, 2026

First seenSep 14, 2026

Weakness typeCWE-862Missing authorization CWE-863Incorrect authorization

How to fix

Patches

Affected products

Product	Affected versions	Fixed in
a2aproject a2a-java	1.2.0	—

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