What is CVE-2026-55529?

CVE-2026-55529 is a medium-severity vulnerability in Mervinpraison Praisonai, classified under Missing Authentication for Critical Function. CVSS score: 6.9/10. Published 2026-08-25.

How severe is CVE-2026-55529?

Medium severity. CVSS v3 base score is 6.9 out of 10.

Auth bypass in Mervinpraison Praisonai

CVE-2026-55529

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.

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 6.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N.

Affected products

Mervinpraison Praisonai — versions < 4.6.58

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-55529?: CVE-2026-55529 is a medium-severity vulnerability in Mervinpraison Praisonai, classified under Missing Authentication for Critical Function. CVSS score: 6.9/10. Published 2026-08-25.
How severe is CVE-2026-55529?: Medium severity. CVSS v3 base score is 6.9 out of 10.