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Description

The Simple Membership plugin for WordPress is vulnerable to Improper Handling of Missing Values in all versions up to, and including, 4.7.0 via the Stripe webhook handler. This is due to the plugin only validating webhook signatures when the stripe-webhook-signing-secret setting is configured, which is empty by default. This makes it possible for unauthenticated attackers to forge Stripe webhook events to manipulate membership subscriptions, including reactivating expired memberships without payment or canceling legitimate subscriptions, potentially leading to unauthorized access and service disruption.

PUBLISHED Reserved 2026-01-27 | Published 2026-02-19 | Updated 2026-02-20 | Assigner Wordfence




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-230 Improper Handling of Missing Values

Product status

Default status
unaffected

* (semver)
affected

Timeline

2026-01-28:Vendor Notified
2026-02-18:Disclosed

Credits

Rafał finder

References

www.wordfence.com/...-8f7d-428b-a596-0751ca047169?source=cve

plugins.trac.wordpress.org/...wpm-stripe-webhook-handler.php

plugins.trac.wordpress.org/...class.swpm-wp-loaded-tasks.php

plugins.trac.wordpress.org/changeset/3453404/

cve.org (CVE-2026-1461)

nvd.nist.gov (CVE-2026-1461)

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