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CVE-2026-105846 · GHSA-w84c-53h3-mc2g

Payload: Untrusted redirect URL parameter exploit

Risk score
44/100
CVSS
6.1 v3.1
Exploit chance (30 days)
0.2%
Published
6 Oct 2026

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What to know

What it is
Payload is a free and open source headless content management system. In versions from 3.40.0 before 3.88.0 and canary versions before 4.0.0-canary.27, an attacker can craft a redirect URL parameter that sends a guest user to an untrusted destination after the authentication flow completes. This issue is fixed in vers…
Affected
payload (npm) >= 3.40.0, < 3.88.0; payload (npm) >= 4.0.0-canary.0, < 4.0.0-canary.27; @payloadcms/next (npm) >= 3.31.0, < 3.88.0; @payloadcms/next (npm) >= 4.0.0-canary.0, < 4.0.0-canary.27
Fix
Upgrade payload to 3.88.0 or 4.0.0-canary.27; @payloadcms/next to 3.88.0 or 4.0.0-canary.27 (whichever matches your release line) or later.
Exploitation
No known exploitation

Story map

Story map: @payloadcms/plugin-form-builderTHE FLAWSTHE FIXCVE-2026-105846Payload: Untrusted redirectURL parameter exploitCVSS 6.1 · EPSS 0%CVE-2026-105857Payload Form Builder has anRCE issueCVSS 10.0 · EPSS 0%CVE-2026-105859Payload: Unauthorized updateto collection documentsCVSS 9.8 · EPSS 0%CVE-2026-105863Payload authentication tokenfield handling issueCVSS 9.4 · EPSS 0%Upgrade…3.88.0 · 4.0.0 · 3.90.0or later on your release lineWho is exposed@payloadcms/plugin-form-builder (npm) < 3.90.0;@payloadcms/plugin-form-builder (npm) >= 4.0.0-canary.0, <4.0.0-canary.34AMBER · PATCH THIS WEEK@payloadcms/plugin-form-builderPayload is a free and open sourceheadless content managementsystem. In@payloadcms/plugin-form-builder versions before 3.90.0 andcanary versions before4.0.0-canary.34, an attacker…Where it standsNo known exploitationCONNECTS TOSame weaknessOpen redirect (CWE-601)20 other warnings in 30 days →Same productEarlier payload warnings20 in the last 90 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

@payloadcms/plugin-form-builder: Amber, patch this week. Payload is a free and open source headless content management system. In @payloadcms/plugin-form-builder versions before 3.90.0 and canary versions before 4.0.0-canary.34, an attacker can craft a form submission that executes code remotely on the server. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.

The flaws

  • CVE-2026-105846: Payload: Untrusted redirect URL parameter exploit (CVSS 6.1 · EPSS 0%)
  • CVE-2026-105857: Payload Form Builder has an RCE issue (CVSS 10.0 · EPSS 0%)
  • CVE-2026-105859: Payload: Unauthorized update to collection documents (CVSS 9.8 · EPSS 0%)
  • CVE-2026-105863: Payload authentication token field handling issue (CVSS 9.4 · EPSS 0%)

The fix

Upgrade @payloadcms/plugin-form-builder: 3.88.0 · 4.0.0 · 3.90.0 or later on your release line

Who is exposed: @payloadcms/plugin-form-builder (npm) < 3.90.0; @payloadcms/plugin-form-builder (npm) >= 4.0.0-canary.0, < 4.0.0-canary.34

Where it stands

  • No known exploitation

Connects to

Why it is Yellow

  • CVSS 6.1 medium
  • On your watchlist: npm

Affected packages

PackageEcosystemVulnerableFixed in
payloadnpm>= 3.40.0, < 3.88.03.88.0
payloadnpm>= 4.0.0-canary.0, < 4.0.0-canary.274.0.0-canary.27
@payloadcms/nextnpm>= 3.31.0, < 3.88.03.88.0
@payloadcms/nextnpm>= 4.0.0-canary.0, < 4.0.0-canary.274.0.0-canary.27

References

Original description

Payload is a free and open source headless content management system. In versions from 3.40.0 before 3.88.0 and canary versions before 4.0.0-canary.27, an attacker can craft a redirect URL parameter that sends a guest user to an untrusted destination after the authentication flow completes. This issue is fixed in versions 3.88.0 and 4.0.0-canary.27.

Last activity 6 Oct 2026. Patch Forecast updates every hour.