CVE-2026-88764mediumCWE-269

CVE-2026-88764: medium-severity vulnerability in Simple Membership

Simple Membership < 4.7.8 - Subscriber+ Membership Level Escalation via PayPal Standard subsc_ref

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33Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 5.4epss 0.2%
The Simple Membership WordPress plugin before 4.7.8 does not validate that the membership level supplied in a PayPal payment notification matches the level configured for the paid payment button, allowing members to pay for a lower-priced membership while being granted a higher, more privileged membership level.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Affected products
Unknown · Simple Membership
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Simple Membership

In the same product, most dangerous first.

CVE-2022-1724—Simple Membership < 4.1.1 - Reflected Cross-Site ScriptingEPSS 1.8%CVE-2022-2317—Simple Membership < 4.1.3 - Unauthenticated Membership Privilege EscalationEPSS 1.4%CVE-2022-2273—Simple Membership < 4.1.3 - Membership Privilege EscalationEPSS 1.2%CVE-2022-4469MEDIUMSimple Membership < 4.2.2 - Contributor+ Stored XSSEPSS 0.5%CVE-2022-0681—Simple Membership < 4.1.0 - Arbitrary Transaction Deletion via CSRFEPSS 0.5%CVE-2026-11855HIGHSimple Membership < 4.7.5 - Unauthenticated Stored XSS via Stripe Webhook API VersionEPSS 0.5%