Login Request a demo
Medium severity · published Sep 14, 2026
CVE-2026-90820
a2aproject a2a-java AuthorizationRequestHandlerDecorator.java AuthorizationRequestHandlerDecorator.onListTasks authorization
4.3
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A2
a2a-java · a2aproject
1.2.0 · source: vendor
Affected product
A2
a2a-java
a2aproject
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90820
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90820
github.com
https://github.com/a2aproject/a2a-java/
github.com
https://github.com/a2aproject/a2a-java/commit/e9a1abf9c90c02b16d17293afdc3cc2f555d63a6
github.com
https://github.com/a2aproject/a2a-java/pull/1038
github.com
https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final
vuldb.com
https://vuldb.com/cve/CVE-2026-90820
vuldb.com
https://vuldb.com/submit/925152
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