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CVE-2026-97337— Simple Membership <= 4.8.3 - Missing Authorization to Unauthenticated Account Takeover and Sensitive Information Disclosure via 'email' Parameter on Activation Endpoints

Quick assessment

Affected
wpinsider-1 Simple Membership
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Simple Membership 插件在 4.8.3 及更早版本中，存在未经授权的数据修改和敏感信息泄露漏洞，该漏洞通过 resend-activation 和 email-activation 接口触发。这些接口在 WordPress 前端初始化过程中由 SwpmInitTimeTasks::check_and_do_email_activation() 函数执行，无需进行任何身份验证、nonce 校验、权限检查或所有权验证。同时，SwpmRegistration::send_reg_e

CVSS 7.5 · High EPSS 0.37% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpinsider-1 Simple Membership ≤ 4.8.3 affected
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I. Basic Information for CVE-2026-97337

Vulnerability Information
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Vulnerability Title
Simple Membership <= 4.8.3 - Missing Authorization to Unauthenticated Account Takeover and Sensitive Information Disclosure via 'email' Parameter on Activation Endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
The Simple Membership plugin for WordPress is vulnerable to unauthorized modification of data and sensitive information disclosure in versions up to, and including, 4.8.3 via the resend-activation and email-activation endpoints. The endpoints are dispatched from SwpmInitTimeTasks::check_and_do_email_activation() on frontend init with no authentication, nonce, capability, or ownership check, and the recipient address used by SwpmRegistration::send_reg_email() is taken from an attacker-controlled $_POST['email'] parameter (overriding the member's registered address). This makes it possible for unauthenticated attackers to redirect an arbitrary pending member's activation email — and the follow-up 'registration complete' email containing the member's username and plaintext password — to an attacker-chosen address, and to then activate that member's account without their consent.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wpinsider-1 Simple Membership 0 ~ 4.8.3 -

II. Public POCs for CVE-2026-97337

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III. Intelligence Information for CVE-2026-97337

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Patches & Fixes for CVE-2026-97337 (2)

Vendor Advisories for CVE-2026-97337 (1)

IV. Related Vulnerabilities

Same product: Simple Membership
Same vendor: wpinsider-1
Same weakness: CWE-862

V. Comments for CVE-2026-97337

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