Critical severity · published Oct 6, 2026
CVE-2026-105863
Payload authentication token field handling issue
9.4
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
payload · payloadcms
>= 3.0.0, < 3.90.0; >= 4.0.0-canary.0, < 4.0.0-canary.34 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105863
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-105863
x_refsource_CONFIRM
https://github.com/payloadcms/payload/security/advisories/GHSA-66wr-7vmr-p5jq
x_refsource_MISC
https://github.com/payloadcms/payload/commit/56cd5cd050a57daebf33159e41e5ff9d4a45239c
x_refsource_MISC
https://github.com/payloadcms/payload/releases/tag/v3.90.0
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