Improper input validation in Mervinpraison Praisonai
CVE-2026-61427
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).
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (31.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Mervinpraison Praisonai — versions 0, 4.6.78
Weakness classification (CWE)
References
- github.com/MervinPraison/PraisonAI/security/advisories/GHSA-hc5v-gxvj-58wh (vendor-advisory)
- www.vulncheck.com/advisories/praisonai-before-authentication-bypass-via-http-st… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-61427?
- CVE-2026-61427 is a high-severity vulnerability in Mervinpraison Praisonai, classified under Improper Input Validation. CVSS score: 7.3/10. Published 2026-07-15.
- How severe is CVE-2026-61427?
- High severity. CVSS v3 base score is 7.3 out of 10.