Medium 6.9Published Aug 25, 2026

CVE-2026-55529PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated unauthenticated tool execution on local MCP server

Updated under an hour ago (2026-10-19 09:10 UTC)

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It affects MervinPraison PraisonAI. Add what you run to find out whether that includes you.

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Every CVE for MervinPraison PraisonAI

Exploited in the last 30 days

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.

CVSS: 6.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
Weakness (CWE): CWE-306, CWE-346
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

MervinPraison PraisonAI mervinpraison:praisonai (from the name)	before 4.6.58	CNA record

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wj6g-v78p-6fx3x-refsource-confirm
https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1x-refsource-misc
https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.