Summary
Payload authentication token field handling issue
Workarounds
There is no complete workaround. Users should upgrade payload packages to >= 3.90.0 or >= 4.0.0-canary.34.
Impact
Under certain field configurations, Payload could include unintended values in the authentication token issued at login.
You are affected if:
- You use an affected Payload version and have configured a custom field option that maps a field to a reserved authentication claim name.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Payload now restricts which field configuration options can influence the contents of the authentication token.
Users should upgrade payload packages to >= 3.90.0 or >= 4.0.0-canary.34.
Frequently Asked Questions
- What is CVE-2026-105863? CVE-2026-105863 is a critical-severity security vulnerability in payload (npm), affecting versions >= 3.0.0, < 3.90.0. It is fixed in 3.90.0, 4.0.0-canary.34.
- Which versions of payload are affected by CVE-2026-105863? payload (npm) versions >= 3.0.0, < 3.90.0 is affected.
- Is there a fix for CVE-2026-105863? Yes. CVE-2026-105863 is fixed in 3.90.0, 4.0.0-canary.34. Upgrade to this version or later.
- Is CVE-2026-105863 exploitable, and should I be worried? Whether CVE-2026-105863 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-105863 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-105863?
- Upgrade
payloadto 3.90.0 or later - Upgrade
payloadto 4.0.0-canary.34 or later
- Upgrade