CVE-2026-34953 PraisonAI: Authentication Bypass in OAuthManager.validate_token()

What is CVE-2026-34953?

CVE-2026-34953 is a critical authentication bypass vulnerability in MervinPraison PraisonAI, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

PraisonAI is a multi-agent teams system. Prior to version 4.5.97, OAuthManager.validate_token() returns True for any token not found in its internal store, which is empty by default. Any HTTP request to the MCP server with an arbitrary Bearer token is treated as authenticated, granting full access to all registered tools and agent capabilities. This issue has been patched in version 4.5.97.

Weakness: CWE-863

Which versions are affected by CVE-2026-34953?

3 open source packages ship an affected version, including praisonai. It affects 1 product.

Products include Praison Praisonai.

How do I fix CVE-2026-34953?

Upgrade praisonai to 4.5.97 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-34953 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34953 exists.

Other vulnerabilities in MervinPraison PraisonAI

• CVE-2026-39888 PraisonAIAgents has a sandbox escape via exception frame traversal in `execute_code` (subprocess mode) Critical 10.0
• CVE-2026-41497 Incomplete fix for CVE-2026-34935: Command Injection in MervinPraison/PraisonAI Critical 9.8
• CVE-2026-40288 PraisonAI: Critical RCE via `type: job` workflow YAML Critical 9.8
• CVE-2026-39890 PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition Loading Critical 9.8
• CVE-2026-34934 PraisonAI: Second-Order SQL Injection in `get_all_user_threads` Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-98f9-fqg5-hvq5, PYSEC-2026-468.