CVE-2026-4298: DSGVO All in One Auth Bypass Vulnerability

CVE-2026-4298 Overview

CVE-2026-4298 is a Missing Authorization vulnerability [CWE-862] affecting the DSGVO All in one for WP plugin for WordPress in all versions up to and including 4.9. The dsgvo_reset_policy_service_func() function lacks both capability checks and nonce verification when processing user-supplied parameters to reset plugin options. Authenticated attackers with Subscriber-level access or higher can reset all customized privacy policy content, including cookie notices, Google Analytics policies, Facebook policies, and YouTube policies, to default values.

Critical Impact
Authenticated users with minimal privileges can wipe customized GDPR/DSGVO privacy policy configurations, potentially exposing site operators to regulatory compliance gaps.

Affected Products

DSGVO All in one for WP WordPress plugin — all versions up to and including 4.9
WordPress sites using the plugin for GDPR/DSGVO compliance notices
Sites with customized cookie, Google Analytics, Facebook, or YouTube policy content

Discovery Timeline

2026-07-09 - CVE-2026-4298 published to NVD
2026-07-09 - Last updated in NVD database

Technical Details for CVE-2026-4298

Vulnerability Analysis

The flaw resides in the dsgvo_reset_policy_service_func() function within dsgvo_all_in_one_wp.php. WordPress plugins are expected to enforce authorization through capability checks such as current_user_can() and to validate request authenticity through nonces via check_ajax_referer() or wp_verify_nonce(). The vulnerable function omits both controls entirely.

Because the endpoint is exposed to any authenticated session, low-privilege roles such as Subscriber can invoke the reset action. The function processes user-supplied parameters and overwrites stored privacy policy options with default values. This shifts a privileged administrative action into a low-barrier operation available to any registered user.

Root Cause

The root cause is a broken access control pattern classified under [CWE-862]. The function relies on the assumption that reset requests originate from a trusted administrator context but does not verify the caller's role or the request's origin. Missing nonce verification also removes cross-site request forgery protection from the workflow.

Attack Vector

An attacker first obtains any authenticated account on the target WordPress site, including a Subscriber account created through open registration. The attacker then issues a request to the vulnerable endpoint that triggers dsgvo_reset_policy_service_func(). The server executes the reset without verifying capability or nonce, replacing customized privacy content with defaults. See the Wordfence Vulnerability Report for further technical detail and the WordPress Plugin Source Code for the affected function.

Detection Methods for CVE-2026-4298

Indicators of Compromise

Sudden reversion of cookie notices, Google Analytics, Facebook, or YouTube policy text to default plugin values
WordPress option table entries for DSGVO plugin keys updated by non-administrator user IDs
Access log entries showing Subscriber-level sessions issuing POST or admin-ajax requests targeting the reset action

Detection Strategies

Enable WordPress audit logging to capture changes to plugin options and correlate the initiating user role
Alert on unauthenticated or low-privilege calls to admin-ajax.php invoking DSGVO plugin actions
Compare stored privacy policy content against a known-good baseline on a scheduled interval

Monitoring Recommendations

Ingest WordPress access logs and audit trails into a centralized SIEM for role-based query capability
Monitor for spikes in Subscriber account registrations followed by requests to plugin AJAX endpoints
Track modifications to wp_options rows associated with the DSGVO plugin and alert on unexpected writes

How to Mitigate CVE-2026-4298

Immediate Actions Required

Update the DSGVO All in one for WP plugin to a version above 4.9 once the vendor publishes a patched release
Restrict new user registration or set the default role to a value that limits plugin AJAX access where feasible
Back up current privacy policy configurations so they can be restored if a reset is triggered

Patch Information

Review the WordPress Plugin Changeset for the vendor's remediation commit. A fixed release should be applied through the standard WordPress plugin update workflow. Confirm the deployed version no longer matches 4.9 or earlier after upgrading.

Workarounds

Disable the DSGVO All in one for WP plugin until an updated version is available
Apply a web application firewall rule that blocks unauthenticated or Subscriber-role requests to the plugin's reset AJAX action
Temporarily close public user registration to reduce the pool of accounts that can invoke the vulnerable function

bash

# Example WordPress CLI check for installed plugin version
wp plugin get dsgvo-all-in-one-for-wp --field=version

# Disable the plugin site-wide until a patched release is applied
wp plugin deactivate dsgvo-all-in-one-for-wp