# A2A Java SDK has a fail-open default task authorization

Advisory record · `GHSA-qw47-mcm5-934w`

- **Identifiers:** `GHSA-qw47-mcm5-934w` · `CVE-2026-111764`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-862](https://cwe.mitre.org/data/definitions/862.html) · [CWE-1188](https://cwe.mitre.org/data/definitions/1188.html)
- **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md) · [CWE-1188](https://agentprime.io/advisories/tag/cwe-1188.md)
- **Published:** 20 Oct 2026
- **Updated:** 20 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 20 Oct 2026, 21:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.a2aproject.sdk:a2a-java-sdk-server-common` (Maven): affected `<1.3.0.Final`; fixed in `1.3.0.Final`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0060, the 49th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:16 UTC: First seen by agentprime
- 31 Oct 2026, 14:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-qw47-mcm5-934w)

## Sources

- [GitHub Advisory Database: GHSA-qw47-mcm5-934w](https://github.com/advisories/GHSA-qw47-mcm5-934w)
- [OSV: GHSA-qw47-mcm5-934w](https://osv.dev/vulnerability/GHSA-qw47-mcm5-934w)
- <https://github.com/a2aproject/a2a-java/security/advisories/GHSA-qw47-mcm5-934w>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-111764>
- <https://github.com/a2aproject/a2a-java/pull/1095>
- <https://github.com/a2aproject/a2a-java/commit/efb4e985e99390c4fc1f78c0a187a4254c0a2553>
- <https://github.com/a2aproject/a2a-java>
- <https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-qw47-mcm5-934w>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-qw47-mcm5-934w/>. Everything for agents: <https://agentprime.io/llms.txt>.