CVE-2026-105857 is a critical-severity (CVSS 10) Code Injection vulnerability in @payloadcms/plugin-form-builder. A fix is available for @payloadcms/plugin-form-builder — see the affected versions and patch details below.
Payload: RCE in Payload Form Builder
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-105857.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-105857 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 394,803 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
@payloadcms/plugin-form-buildernpmDescription
Impact
A vulnerability in @payloadcms/plugin-form-builder in versions < 3.90.0 allow submissions which could be crafted to execute remote code on the server.
You are affected if:
- You are using
@payloadcms/plugin-form-builder
Patches
Users should upgrade Payload packages to >= 3.90.0 or >= 4.0.0-canary.34.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @payloadcms/plugin-form-builder | all versions | 3.90.0npm install @payloadcms/plugin-form-builder@3.90.0 |
| 📦npm | @payloadcms/plugin-form-builder | ≥ 4.0.0-canary.0&&< 4.0.0-canary.34 | 4.0.0-canary.34npm install @payloadcms/plugin-form-builder@4.0.0-canary.34 |
Affected Products
payloadpayloadcmsDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @payloadcms/plugin-form-builder, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @payloadcms/plugin-form-builder to 3.90.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-105857 is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
Frequently Asked Questions
Is CVE-2026-105857 in your dependencies?
Find it across npm, including transitive dependencies.