CVE-2025-7689: Hydra Booking Privilege Escalation Flaw

CVE-2025-7689 Overview

CVE-2025-7689 is a privilege escalation vulnerability in the Hydra Booking plugin for WordPress, affecting versions 1.1.0 through 1.1.18. The flaw exists in the tfhb_reset_password_callback() function, which lacks a capability check. Authenticated attackers with Subscriber-level access or higher can reset the password of an Administrator account. Successful exploitation grants full administrative control over the WordPress site. The vulnerability is classified under [CWE-862] Missing Authorization.

Critical Impact
Any authenticated user, including low-privilege Subscribers, can take over Administrator accounts and gain complete control of the affected WordPress site.

Affected Products

Hydra Booking plugin for WordPress versions 1.1.0 through 1.1.18
WordPress sites with vulnerable Hydra Booking installations
All hosting environments running the affected plugin versions

Discovery Timeline

2025-07-29 - CVE-2025-7689 published to the National Vulnerability Database (NVD)
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-7689

Vulnerability Analysis

The vulnerability resides in the tfhb_reset_password_callback() function exposed by the Hydra Booking plugin. This callback handles password reset operations but does not verify whether the requesting user has the authority to reset another account's credentials. As a result, any authenticated user can invoke the endpoint and target arbitrary accounts, including Administrators.

After resetting an Administrator password, the attacker logs in as that user and gains full control of the WordPress installation. This includes plugin installation, theme modification, user management, and arbitrary PHP execution through standard administrative functionality. The impact extends beyond the WordPress instance to any connected services or stored credentials.

Root Cause

The root cause is a missing capability check in the AJAX or REST callback tfhb_reset_password_callback(). WordPress requires developers to validate user permissions with current_user_can() before sensitive operations. The plugin authenticates the requester through the standard nonce or login session but omits the authorization step that confirms the caller may modify the target account.

Attack Vector

Exploitation requires only Subscriber-level credentials, which are commonly available on sites that permit open user registration. The attacker authenticates, then issues a crafted request to the password reset endpoint specifying an Administrator user identifier and a new password value. No user interaction from the Administrator is required.

The vulnerability mechanism involves a network-accessible callback that processes user-controlled input identifying the account to reset. Without an authorization check, the plugin completes the reset and persists the new password. See the Wordfence Vulnerability Report and the WordPress Plugin Changeset for technical specifics of the fix.

Detection Methods for CVE-2025-7689

Indicators of Compromise

Unexpected password changes on Administrator accounts recorded in WordPress user metadata or audit logs
HTTP POST requests to admin-ajax.php or REST endpoints referencing tfhb_reset_password from authenticated low-privilege sessions
New plugin installations, theme edits, or PHP file modifications shortly after a suspicious password reset event
Login activity from unusual IP addresses for Administrator accounts following Subscriber-tier requests

Detection Strategies

Inspect web server access logs for requests containing the tfhb_reset_password_callback action originating from non-administrative session cookies
Review WordPress user activity logs for password reset events not initiated through the standard wp-login.php?action=lostpassword flow
Correlate Subscriber account logins with subsequent Administrator privilege actions in the same session window
Monitor file integrity on wp-content/plugins/ and wp-content/themes/ for unauthorized modifications following suspicious authentication events

Monitoring Recommendations

Enable verbose WordPress audit logging through a security plugin to capture all role and password changes
Alert on creation of new administrative users or elevation of existing user roles
Track outbound connections from the WordPress host that follow a password reset event, indicating possible data exfiltration
Aggregate WordPress, web server, and authentication logs in a centralized platform for cross-source correlation

How to Mitigate CVE-2025-7689

Immediate Actions Required

Update the Hydra Booking plugin to version 1.1.19 or later, which introduces the missing capability check
Audit all WordPress user accounts for unauthorized role changes or unexpected password resets since the plugin was installed
Force a password reset for all Administrator accounts and rotate any associated API keys or application passwords
Disable open user registration if not required, and review the default role assigned to new registrations

Patch Information

The vendor addressed the issue in the WordPress Plugin Changeset 3334439, which adds the required authorization check to tfhb_reset_password_callback(). Site administrators should update Hydra Booking to the patched release available through the WordPress Plugin Repository.

Workarounds

Deactivate and remove the Hydra Booking plugin until the patched version can be deployed
Restrict access to admin-ajax.php and plugin REST endpoints using a web application firewall rule that blocks tfhb_reset_password actions from non-admin users
Temporarily set the default new-user role to a custom role with no capabilities to limit the pool of accounts that can authenticate
Enable multi-factor authentication on all Administrator accounts to reduce the impact of a successful password reset

bash

# Example WAF rule to block exploitation attempts at the edge
# Deny POST requests targeting the vulnerable action from unauthenticated or low-privilege contexts
SecRule REQUEST_URI "@contains admin-ajax.php" \
  "chain,deny,status:403,id:1007689,msg:'Block Hydra Booking CVE-2025-7689 exploit attempt'"
  SecRule ARGS:action "@streq tfhb_reset_password_callback"