CVE-2026-105863: Payloadcms Payload

Critical severity, CVSS 9.2. EPSS: 0.4% chance of exploitation in the next 30 days.

Payload is a free and open source headless content management system. In versions after 3.0.0 and before 3.90.0, a custom field option that maps a field to a reserved authentication claim name can place unintended values in the authentication token issued at login. This issue is fixed in version 3.90.0.

Affected products

• Payloadcms Payload: from 3.0.0, before 3.90.0 (fixed in 3.90.0); from 4.0.0-canary.0, before 4.0.0-canary.34 (fixed in 4.0.0-canary.34)

Published 2026-10-06. Last modified 2026-10-09.