Membership Plugin – Restrict Content <= 3.2.18 - Authenticated (Administrator+) Stored Cross-Site Scripting via Invoice Settings
Strategic Overview
- Status
- Patched in 3.2.19
- Affected Plugin
- Membership Plugin – Kadence Memberships
- Affected Version
<= 3.2.18- CVSS
- 4.4Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2026-1304
At a glance
CVE-2026-1304 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Membership Plugin WordPress plugin, affecting versions <= 3.2.18. It carries a CVSS score of 4.4 (reachable over the network). Exploitation requires an authenticated account at Administrator level or above. The issue is fixed in version 3.2.19; sites on affected versions should update now. Disclosed February 2026, reported by Miguel Santareno.
Vulnerability Overview
The Membership Plugin – Restrict Content for WordPress is vulnerable to Stored Cross-Site Scripting via multiple invoice settings fields in all versions up to, and including, 3.2.18 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Membership Plugin <= 3.2.18 takes an account at Administrator level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Membership Plugin the fix is 3.2.19: builds <= 3.2.18 are affected, anything from 3.2.19 onward is not.
Remediation
Update to version 3.2.19, or a newer patched version
How does WordSec protect against this?
An attacker needs Administrator access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Membership Plugin 3.2.19 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Membership Plugin – Kadence Memberships
- 9.3CVE-2026-9273: Membership Plugin Password Reset Link Poisoning
CVE-2026-9273 - 8.2CVE-2025-14844: Membership Plugin Missing Authentication
CVE-2025-14844 - 8.1CVE-2026-1321: Membership Plugin Privilege Escalation
CVE-2026-1321 - 5.3CVE-2026-32546: Membership Plugin Missing Authorization
CVE-2026-32546 - 5.3CVE-2024-11090: Membership Plugin Content Restriction Bypass
CVE-2024-11090 - 5.3CVE-2024-31432: Restrict Content <= 3.2.8 Missing Authorization
CVE-2024-31432 - 5.3CVE-2023-47668: Restrict Content <= 3.2.7 Information Exposure
CVE-2023-47668 - 5.3Restrict Content <= 3.2.2 Notice Dismissal
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