High severity · published Oct 6, 2026
CVE-2026-105858
Payload: Remote Code Execution through first-register
8.1
CVSS
0.5%
EPSS
No
On KEV
Description
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, a crafted request to the public first-register operation can execute code remotely when local authentication is enabled and no initial user has been created. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
payload · payloadcms
< 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-2026-105858
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-105858
x_refsource_CONFIRM
https://github.com/payloadcms/payload/security/advisories/GHSA-97rh-rhh2-7vjv
x_refsource_MISC
https://github.com/payloadcms/payload/commit/e947fc4ba4a434f276d043386e501b1d14eda679
x_refsource_MISC
https://github.com/payloadcms/payload/releases/tag/v3.90.0
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