payload: Improper Enforcement of a Single, Unique Action
CVE-2026-105850 is a high-severity improper enforcement of a single, unique action vulnerability in payload from PayloadCMS, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected payload versions: < 3.90.0; >= 4.0.0-canary.0, < 4.0.0-canary.34. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.31% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of payload you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on github.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Payloadcms | payload | < 3.90.0; >= 4.0.0-canary.0, < 4.0.0-canary.34 | Not stated |
| @payloadcms | plugin-ecommerce | < 3.90.0; >= 4.0.0-canary.0, < 4.0.0-canary.34 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- LowPerformance or availability is reduced.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.8 | High | CNA (github.com) |
| CVSS 3.1 | 8.2 | High | NVD |
Official description
Payload is a free and open source headless content management system. In @payloadcms/plugin-ecommerce versions before 3.90.0 and canary versions before 4.0.0-canary.34, use of the Stripe payment adapter can allow a Stripe order confirmation to be processed more than once under certain conditions. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Enforcement of a Single, Unique Action
The product requires that an actor should only be able to perform an action once, or to have only one unique action, but the product does not enforce or incorrectly enforces this restriction.
More Improper Enforcement of a Single, Unique Action vulnerabilities (CWE-837)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Other vulnerabilities in payload
- 7.1 High severity
- 7.1 High severity
- 7.5 High severity
- 8.1 High severity
- 9.4 Critical severity
- 8.7 High severity
Recent Improper Enforcement of a Single, Unique Action vulnerabilities
- 7.5 High severity
- 7.5 High severity
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