VulnerabilityAnalyzed

CVE-2026-105863

Payload is a free and open source headless content management system.

CRITICAL 9.2EPSS 0.38%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.38%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

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.

CVSS 4.0: 9.2 CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.38% probability · 31th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-290, CWE-915
Affected: payloadcms/payload
Source: security-advisories@github.com

EPSS trend

EPSS moved from 0.4% on 7 October 2026 to 0.4% on 26 October 2026.

References

https://github.com/payloadcms/payload/commit/56cd5cd050a57daebf33159e41e5ff9d4a45239cPatch
https://github.com/payloadcms/payload/releases/tag/v3.90.0Patch, Release Notes
https://github.com/payloadcms/payload/security/advisories/GHSA-66wr-7vmr-p5jqVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.