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Payload: Untrusted redirect URL parameter exploit

Moderate severity GitHub Reviewed Published Sep 22, 2026 in payloadcms/payload • Updated Oct 6, 2026

Package

npm @payloadcms/next (npm)

Affected versions

>= 3.31.0, < 3.88.0
>= 4.0.0-canary.0, < 4.0.0-canary.27

Patched versions

3.88.0
4.0.0-canary.27
npm payload (npm)
>= 3.40.0, < 3.88.0
>= 4.0.0-canary.0, < 4.0.0-canary.27
3.88.0
4.0.0-canary.27

Description

Impact

Under certain conditions, an attacker can craft a redirect link that sends a guest user to an untrusted destination after authenticating.

Patches

Users should upgrade Payload packages to >= 3.88.0 or >= 4.0.0-canary.27.

Workarounds

Upgrading is recommended. Until then, remove user-controlled redirect values from authentication flows or restrict them to known local paths.

References

@DanRibbens DanRibbens published to payloadcms/payload Sep 22, 2026
Published to the GitHub Advisory Database Oct 6, 2026
Reviewed Oct 6, 2026
Last updated Oct 6, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

Weaknesses

URL Redirection to Untrusted Site ('Open Redirect')

The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. Learn more on MITRE.

CVE ID

CVE-2026-105846

GHSA ID

GHSA-w84c-53h3-mc2g

Source code

Credits

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