What is CVE-2026-55536?

CVE-2026-55536 is a critical-severity vulnerability in Mervinpraison Praisonai, classified under Improper Access Control. CVSS score: 9.1/10. Published 2026-08-25.

How severe is CVE-2026-55536?

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

Vulnerability in Mervinpraison Praisonai

CVE-2026-55536

PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, Browser Server _handle_connection() checks Chrome extension origins with re.match() and the unanchored expression chrome-extension://[a-z0-9]{32}. Extra trailing characters pass before websocket.accept(), allowing start_session commands and unauthorized browser automation. This issue is fixed in version 4.6.58.

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.

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-2026-55536?: CVE-2026-55536 is a critical-severity vulnerability in Mervinpraison Praisonai, classified under Improper Access Control. CVSS score: 9.1/10. Published 2026-08-25.
How severe is CVE-2026-55536?: Critical severity. CVSS v3 base score is 9.1 out of 10.