CVE-2026-55529CWE-306CWE-346

CVE-2026-55529

Medium · published August 25, 2026

CVSS v3.1
6.9
EPSS
0%
Percentile
6.6
In the wild
Unconfirmed
What it is

PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, the MCP HTTP Stream _validate_origin method accepts request_origin.startswith(allowed), so the attacker-controlled localhost.evil.example HTTP origin matches the localhost allowlist. Without an API key, a malicious webpage can submit tools/call requests to the local MCP server and execute exposed tools. This issue is fixed in version 4.6.58.

The record
Technical detail
CVSS v3.1
6.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00175 · 6.6th percentile
Weaknesses
CWE-306 · Missing Authentication for Critical Function; CWE-346 · Origin Validation Error
Published
2026-08-25T19:16Z
References (4)
https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1 · [email protected]https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58 · [email protected]https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wj6g-v78p-6fx3 · [email protected]https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wj6g-v78p-6fx3 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 27 AUG 06:36Z
    EPSS moved — → 0%
    epss
  • 25 AUG 14:26Z
    PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated unauthenticated tool execution on local MCP server
    cvelistv5