RegistrationMagic <= 6.0.8.6 - Authenticated (Subscriber+) Authentication Bypass via Forged PayPal IPN Request

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-9242
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-27 08:16:45 UTC
Updated2026-06-27 08:16:45 UTC
DescriptionThe RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress is vulnerable to Authentication Bypass via Insufficient Verification of Data Authenticity in all versions up to and including 6.0.8.6. This is due to the PayPal IPN `callback` handler being registered as a nopriv AJAX action with no authentication or nonce requirement, and critically because the handler updates the payment log database row with attacker-controlled POST data — including `payment_status` and the `custom` field encoding the target `user_id` — before PayPal IPN validation is performed, meaning the database remains poisoned even when validation subsequently fails. This makes it possible for unauthenticated attackers to authenticate as any WordPress user, including administrators, by submitting a forged IPN request that overwrites a payment log entry's `user_id` with that of a target account, then visiting the success return URL with a legitimately obtained security hash to cause the plugin to issue real WordPress authentication cookies for the targeted account.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Problem Types: CWE-345 | CWE-345 CWE-345 Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Metagauss RegistrationMagic Custom Registration Forms User Registration Payment And User Login affected 6.0.8.6 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/1dcf68fd-e9d3-4a46-8bd4-15c25... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-registration-form-builder-with-submission-mana... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Rafael Gunawan (kokon) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-21T19:17:52.000ZVendor Notified
CNA2026-06-26T18:09:49.000ZDisclosed
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