CVE-2026-61427 PraisonAI before 4.6.78 Authentication Bypass via HTTP-stream
Unauthenticated attackers can access MCP tools and execute arbitrary code if the server is bound to a network interface without an API key.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-61427?
CVE-2026-61427 is a medium-severity authentication bypass vulnerability in MervinPraison PraisonAI, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PraisonAI before 4.6.78 exposes the MCP HTTP-stream transport without authentication by default: the CLI --api-key option defaults to None, and the server only enforces Authorization/Bearer checks when an API key is configured. When an operator runs 'praisonai mcp serve --transport http-stream' without an API key, an unauthenticated client (no Authorization header, and no Origin header, which is also permitted) can initialize a session, enumerate the available tools (tools/list), and invoke tools (tools/call). Additionally, the dispatcher forwards tool-call arguments to handlers without validating them against the advertised inputSchema. The server binds to 127.0.0.1 by default, so remote exploitation requires the operator to bind to a network-accessible address (e.g., --host 0.0.0.0).
Weakness: CWE-20
Which versions are affected by CVE-2026-61427?
3 open source packages ship an affected version, including praisonai.
| Package | Affected | Fixed in |
|---|---|---|
praisonai PyPI | All versions | 4.6.78 |
praisonai PyPI | All versions | 4.6.78 |
praisonai PyPI | All versions | 4.6.78 |
How do I fix CVE-2026-61427?
Upgrade praisonai to 4.6.78 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-61427 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61427 exists.
Sources
Also known as CVE-2026-62178, GHSA-hc5v-gxvj-58wh, PYSEC-2026-4257.