What is CVE-2026-34953?

CVE-2026-34953 is a critical-severity vulnerability in Mervinpraison Praisonai, classified under Incorrect Authorization. CVSS score: 9.1/10. Published 2026-04-03.

How severe is CVE-2026-34953?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Mervinpraison Praisonai

CVE-2026-34953

PraisonAI is a multi-agent teams system. Prior to version 4.5.97, OAuthManager.validate_token() returns True for any token not found in its internal store, which is empty by default. Any HTTP request to the MCP server with an arbitrary Bearer token is treated as authenticated, granting full access to all registered tools and agent capabilities. This issue has been patched in version 4.5.97.

Vulnerability class: Broken Access Control

Published 2026-04-03 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% 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 < 4.5.97
Praison Praisonai

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

github.com/MervinPraison/PraisonAI/security/advisories/GHSA-98f9-fqg5-hvq5 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34953?: CVE-2026-34953 is a critical-severity vulnerability in Mervinpraison Praisonai, classified under Incorrect Authorization. CVSS score: 9.1/10. Published 2026-04-03.
How severe is CVE-2026-34953?: Critical severity. CVSS v3 base score is 9.1 out of 10.