What is CVE-2026-105859?

CVE-2026-105859 is a critical-severity vulnerability in Payloadcms Payload, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2026-10-06.

How severe is CVE-2026-105859?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Payloadcms Payload

CVE-2026-105859

Payload is a free and open source headless content management system. In versions before 3.90.0 and canary versions before 4.0.0-canary.34, an attacker can submit a request to a specific update endpoint that modifies collection documents without enforcing collection or field-level access control when orderable is enabled on a collection or join field. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-10-06 · last modified 2026-10-06.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Payloadcms Payload — versions < 3.90.0, >= 4.0.0-canary.0, < 4.0.0-canary.34

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-105859?: CVE-2026-105859 is a critical-severity vulnerability in Payloadcms Payload, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2026-10-06.
How severe is CVE-2026-105859?: Critical severity. CVSS v3 base score is 9.8 out of 10.