CVE-2026-90820

a2aproject a2a-java AuthorizationRequestHandlerDecorator.java AuthorizationRequestHandlerDecorator.onListTasks authorization

MEDIUM
4.3
CVSS Score
Published: September 14, 2026 at 08:45 PM UTC
Updated: September 15, 2026 at 02:51 PM UTC
1 product affected across 1 vendorA2A Java

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vendor states this is fixed in 1.3.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (8)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/403323
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/403323/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-90820
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/925152
Issue TrackingPatch
Source: cverecord
https://github.com/a2aproject/a2a-java/pull/1038

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-862CWE-863

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