CVE-2026-1461

Simple Membership <= 4.7.0 - Unauthenticated Improper Handling of Missing Values

2026-02-18 00:00

Strategic Overview

Status: Patched in 4.7.1
Affected Plugin: Simple Membership
Affected Version: <= 4.7.0
CVSS: 6.5Medium
Weakness type: CWE-230 · Improper Handling of Missing Values
CVE: CVE-2026-1461

View all Simple Membership vulnerabilities

At a glance

CVE-2026-1461 is a medium-severity Improper Handling of Missing Values vulnerability in the Simple Membership WordPress plugin, affecting versions <= 4.7.0. It carries a CVSS score of 6.5 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 4.7.1; sites on affected versions should update now. Disclosed February 2026, reported by 0N0ise.

Vulnerability Overview

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.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-230: Improper Handling of Missing Values

The product does not handle or incorrectly handles when a parameter, field, or argument name is specified, but the associated value is missing, i.e. it is empty, blank, or null.

Remediation

Update to version 4.7.1, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Simple Membership 4.7.1 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-1461 https://www.wordfence.com/threat-intel/vulnerabilities/id/4e4df9a6-8f7d-428b-a596-0751ca047169 https://nvd.nist.gov/vuln/detail/CVE-2026-1461

Related records

Other vulnerabilities in Simple Membership

CVSS Vector

6.5

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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