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CVE-2026-14563 – Authentication Bypass (Full Account Takeover) – Advanced Customized Prompts WordPre

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Summary

CVE-2026-14563 is a critical authentication bypass vulnerability (CVSS 9.8) affecting the Advanced Customized Prompts WordPress plugin, versions through 1.0.1. The plugin issues an authenticated session for a supplied email address without verifying the corresponding password in an unauthenticated action, allowing a remote, unauthenticated attacker to log in as any registered user — including administrators — or create arbitrary new accounts. Given the network-based attack vector and lack of any authentication or user interaction requirement, this flaw poses a severe risk of full site compromise.

Technical details

  • Root cause: The plugin’s login/registration handling logic accepts a user-supplied email address and establishes an authenticated WordPress session without validating the associated account password, violating standard authentication assurance controls (CWE-287: Improper Authentication).
  • Trigger conditions: The vulnerable code path is reachable via an unauthenticated action exposed by the plugin (e.g., an AJAX or REST action registered for logged-out users), meaning no prior credentials or site access are required to exploit it.
  • Attack vector: Network — an attacker only needs to know or guess a valid site user’s email address (including the administrator’s, which is often discoverable) to hijack that account, or can supply an arbitrary email to create a new authenticated account.
  • Impact: Full compromise of confidentiality, integrity, and availability of the WordPress site, since an attacker can impersonate an administrator, install malicious plugins/themes, modify content, exfiltrate data, or pivot further into the hosting environment.

Affected software

  • Advanced Customized Prompts WordPress plugin, all versions 0 through 1.0.1

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: As of this writing, no patched version of the Advanced Customized Prompts plugin has been confirmed as publicly available. Site owners should check the plugin’s changelog in the WordPress plugin repository regularly and upgrade to the fixed release as soon as the vendor publishes one.
  • If no patch is available:
    • Deactivate and remove the Advanced Customized Prompts plugin until a fix is released.
    • If the plugin must remain active, block or restrict access to its unauthenticated login/registration action endpoints at the web application firewall (WAF) or reverse proxy layer.
    • Enforce multi-factor authentication for administrator and privileged accounts where possible to reduce impact from session hijacking.
    • Monitor authentication logs for anomalous logins or new account creations that do not correspond to legitimate password-based logins.

References

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