What is CVE-2026-61436?

CVE-2026-61436 is a high-severity vulnerability in Mervinpraison Praisonai, classified under Improper Authentication. CVSS score: 8.6/10. Published 2026-07-15.

How severe is CVE-2026-61436?

High severity. CVSS v3 base score is 8.6 out of 10.

Auth bypass in Mervinpraison Praisonai

CVE-2026-61436

PraisonAI before 4.6.78 fails to verify Svix webhook signatures in AgentMail webhook mode, allowing unauthenticated attackers to forge message.received events. Attackers can send crafted JSON payloads to the webhook endpoint to invoke configured agents with arbitrary sender addresses and message content.

Vulnerability class: Broken Authentication

EPSS: 0.005 (41.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L.

Affected products

Mervinpraison Praisonai — versions 0, 4.6.78

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-61436?: CVE-2026-61436 is a high-severity vulnerability in Mervinpraison Praisonai, classified under Improper Authentication. CVSS score: 8.6/10. Published 2026-07-15.
How severe is CVE-2026-61436?: High severity. CVSS v3 base score is 8.6 out of 10.