Vulnerability · Published Jul 15, 2026 · Assigned by VulnCheck

CVE-2026-61427PraisonAI before 4.6.78 Authentication Bypass via HTTP-stream

High 7.3

In plain English

A high-severity improper input validation in PraisonAI from MervinPraison. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.4%top 62.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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).

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	praisonai	4.6.78	GHSA-hc5v-gxvj-58wh
PyPI	praisonai	4.6.78	PYSEC-2026-4257

Affected products (as reported)

Vendor	Product	Versions
MervinPraison	PraisonAI	0 – before 4.6.78

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

GitHub Security Advisory (GHSA-hc5v-gxvj-58wh) vendor-advisory
VulnCheck Advisory: PraisonAI before 4.6.78 Authentication Bypass via HTTP-stream third-party-advisory