CVE-2026-105863 Payload authentication token field handling issue
Attackers can escalate privileges by mapping custom fields to reserved authentication claims in Payload CMS, requiring a non-default configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-105863?
CVE-2026-105863 is a critical authentication bypass vulnerability in payloadcms payload, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-105863?
4 open source packages ship an affected version, including payload. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
payload npm | From 3.0.0 | 3.90.0 |
payload npm | From 3.0.0 | 3.90.0 |
payload npm | From 4.0.0-canary.0 | 4.0.0-canary.34 |
payload npm | From 4.0.0-canary.0 | 4.0.0-canary.34 |
Products include Payloadcms Payload.
How do I fix CVE-2026-105863?
Upgrade payload to a fixed version for your release line: 3.90.0 or 4.0.0-canary.34.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-105863 being exploited?
There is no known exploitation of CVE-2026-105863 in the wild and no public exploit code.
Other vulnerabilities in payloadcms payload
- CVE-2026-105857 Payload: RCE in Payload Form Builder
- CVE-2026-105859 Payload: Unauthorized update to collection documents
- CVE-2026-25544 Payload has an SQL Injection in JSON/RichText Queries on PostgreSQL/SQLite Adapters
- CVE-2022-27952 Unrestricted Upload of File with Dangerous Type in Payload
- CVE-2026-105851 Payload: Field access control bypass on auth collections
Sources
Also known as GHSA-66wr-7vmr-p5jq.