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CVE-2026-12417 critical CVSS 9.8

Vulnerability in SignUp & SignIn (WordPress plugin) (CVE-2026-12417)

Summary

Vulnerability in SignUp & SignIn (WordPress plugin) (CVE-2026-12417). Successful exploitation can lead to full system takeover. Exploitable via wp_ajax_nopriv_pravel_change_password.

Original description

The description as published by the source.

The SignUp & SignIn plugin for WordPress is vulnerable to Authentication Bypass via Weak Password Reset Validation leading to Account Takeover in versions up to, and including, 1.0.0. This is due to the pravel_change_password() AJAX handler — registered via wp_ajax_nopriv_pravel_change_password and therefore accessible to unauthenticated users — performing no nonce verification, no capability check, and only a loose equality check between an attacker-supplied reset_activation_code POST parameter and the target user's forgot_email user meta value; when a user has never initiated a password reset, get_user_meta() returns an empty string that trivially satisfies this check against an omitted or empty attacker-supplied code. This makes it possible for unauthenticated attackers to change the password of any WordPress user, including administrators, by sending a crafted POST request to admin-ajax.php with action=pravel_change_password, reset_user_id set to the target account's user ID, and new_password_custom set to an attacker-chosen password. Successful exploitation allows the attacker to authenticate with the newly set password and fully take over the targeted account, achieving administrator-level privilege escalation on the affected site.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-12417 has been found in SignUp & SignIn (WordPress plugin).
Attackers can target a specific entry point like wp_ajax_nopriv_pravel_change_password over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "SignUp & SignIn (WordPress plugin) CVE-2026-12417" on the vendor's site.

CVE-2026-12417 (SignUp & SignIn (WordPress plugin)) — CWE-640 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: wp_ajax_nopriv_pravel_change_password / reset_activation_code / forgot_email / reset_user_id
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-640) exists in SignUp & SignIn (WordPress plugin). Attackers reach the vulnerable code path via wp_ajax_nopriv_pravel_change_password without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of SignUp & SignIn (WordPress plugin). Attack surface: wp_ajax_nopriv_pravel_change_password / reset_activation_code / forgot_email / reset_user_id.

🔥 Severity

Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで SignUp & SignIn (WordPress plugin) を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

References

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