# CVE-2026-55528: PraisonAI AgentServer authentication bypass on all routes

Source: https://junglewise.ai/threats/cve-2026-55528-praisonai-agentserver-authentication-bypass-on-all-routes  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-25. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-55528 · Severity: high · CVSS 8.2 · Published 2026-08-25

PraisonAI's agent server includes a configuration option for authentication tokens, but this protection is not actually implemented in the code. An attacker on the network can send commands to agents, listen to all server events, and access server configuration without any credentials. This means organizations relying on the authentication setting for security have no actual protection.

Technologies: [MervinPraison PraisonAI Agents](https://junglewise.ai/threats/technologies/praisonai-agents), [praisonaiagents (PyPI)](https://junglewise.ai/threats/technologies/pypi-praisonaiagents). Vendors: [MervinPraison](https://junglewise.ai/threats/vendors/mervinpraison), [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-55528 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55528 being exploited in the wild.

**How severe is CVE-2026-55528?** High severity, with a CVSS score of 8.2, published 25 August 2026.

**Which products and versions are affected?** MervinPraison PraisonAI Agents < 1.6.58; praisonaiagents (PyPI) ECOSYSTEM:introduced=0,fixed=1.6.58.

**Is there a fix for CVE-2026-55528?** Yes. praisonaiagents (PyPI): upgrade to 1.6.58 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-55528 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-55528?** Check whether you run MervinPraison PraisonAI Agents or praisonaiagents (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- praisonaiagents (PyPI): upgrade to 1.6.58 or later

  ```sh
  pip install "praisonaiagents>=1.6.58"
  ```


## Technical details

The vulnerability is an authentication bypass in `praisonaiagents.server.AgentServer`. The component's `ServerConfig` class defines an `auth_token: Optional[str]` field, and the `/info` endpoint displays it masked as "***" when configured, strongly implying bearer-token authentication is enforced. However, `AgentServer._create_app()` never reads the token, adds authentication middleware, or uses FastAPI `Depends()` guards—all routes are registered without any authorization checks. The same package's `A2A` server implements proper bearer-token validation via `_verify_auth()`, confirming the developer knew the pattern but did not apply it here. Attack vectors include: (1) injecting arbitrary events via `POST /publish` to all subscribed agents; (2) eavesdropping on all agent observations, plans, and prompts via `GET /events`; (3) leaking CORS origins and confirming high-value targets via `GET /info`. The vulnerability requires network adjacency but no authentication. Fixed in version 1.6.58.

## Affected products

- MervinPraison praisonaiagents < 1.6.58

## Identifiers

- CVE-2026-55528
- GHSA-7g3p-92qq-8wvh
- PYSEC-2026-3899

## Timeline

- 2026-06-13: disclosed
- 2026-08-25: advisory
- 2026-08-25: patched: Version 1.6.58 released with fix

## References

- [https://api.github.com/users/SnailSploit](https://api.github.com/users/SnailSploit)
- [https://github.com/SnailSploit](https://github.com/SnailSploit)
- [https://api.github.com/users/SnailSploit/gists%7B/gist_id%7D](https://api.github.com/users/SnailSploit/gists%7B/gist_id%7D)
- [https://api.github.com/users/SnailSploit/repos](https://api.github.com/users/SnailSploit/repos)
- [https://avatars.githubusercontent.com/u/95986478?v=4](https://avatars.githubusercontent.com/u/95986478?v=4)
- [https://api.github.com/users/SnailSploit/events%7B/privacy%7D](https://api.github.com/users/SnailSploit/events%7B/privacy%7D)

## Related threats

- [PraisonAI SearxNG URL validation bypass in search tools](https://junglewise.ai/threats/cve-2026-57143-praisonai-server-side-request-forgery-ssrf-in-searxng-search-web)
- [PraisonAI missing access control in API endpoints](https://junglewise.ai/threats/cve-2026-57118-praisonai-agentteam-launch-exposes-unauthenticated-remote-agent)
- [PraisonAI legacy SSE endpoint CORS and authentication bypass](https://junglewise.ai/threats/cve-2026-57112-praisonai-legacy-sse-endpoint-cors-and-authentication-bypass)
- [PraisonAI IMAP injection in email tools](https://junglewise.ai/threats/cve-2026-57130-praisonai-imap-injection-in-email-tools)
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