CVE-2026-105858
Received Received - Intake

Remote Code Execution in Payload CMS

Publication date: 2026-10-06

Last updated on: 2026-10-06

Assigner: GitHub, Inc.

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.

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Meta Information

Published
2026-10-06
Last Modified
2026-10-06
Generated
2026-10-06
AI Q&A
2026-10-06
EPSS Evaluated
N/A
NVD
CVE-2026-105858
EUVD
EUVD-2026-93502

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
payloadcms payload < 3.90.0
payloadcms payload >= 4.0.0-canary.0, < 4.0.0-canary.34

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
CWE-1321 The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

Attack-Flow Graph

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Executive Summary

This vulnerability affects Payload, 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 specially crafted request to the public first-register operation can allow remote code execution if local authentication is enabled and no initial user has been created.

Detection Guidance

To detect this vulnerability, check if your Payload CMS version is before 3.90.0 or canary versions before 4.0.0-canary.34. Use commands like 'npm list payloadcms' or check the version in the admin panel. If vulnerable, update immediately.

Impact Analysis

An attacker could exploit this to execute arbitrary code on the server running the vulnerable Payload instance. This could lead to full system compromise, data theft, or further network infiltration depending on the server's environment and permissions.

Compliance Impact

This vulnerability allows remote code execution (RCE) under specific conditions, which could lead to unauthorized access, data breaches, or data manipulation. Such breaches may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data security) by exposing sensitive user or patient data.

Mitigation Strategies

Upgrade Payload CMS to version 3.90.0 or later if using the stable release, or to version 4.0.0-canary.34 or later if using the canary release. This addresses the crafted request vulnerability in the first-register operation.

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