CVE-2026-81777: Essential Addons Authentication Bypass Flaw

CVE-2026-81777 Overview

CVE-2026-81777 is an Authentication Bypass by Spoofing vulnerability [CWE-290] affecting the WPDeveloper Essential Addons for Elementor plugin for WordPress. The flaw allows attackers to spoof identity through a CAPTCHA bypass condition, undermining the integrity of forms and workflows that rely on CAPTCHA validation. All plugin versions up to and including 6.8.0 are affected.

The vulnerability requires no authentication, no user interaction, and is exploitable over the network. Successful exploitation permits identity spoofing against endpoints that trust CAPTCHA challenges as an anti-abuse control.

Critical Impact
Unauthenticated attackers can bypass CAPTCHA-based identity verification in Essential Addons for Elementor, enabling automated abuse of protected forms and identity spoofing against WordPress sites using the plugin.

Affected Products

WPDeveloper Essential Addons for Elementor (Lite)
All versions from unspecified initial release through 6.8.0
WordPress sites using Essential Addons form widgets protected by CAPTCHA

Discovery Timeline

2026-08-28 - CVE-2026-81777 published to the National Vulnerability Database
2026-08-28 - Last updated in NVD database

Technical Details for CVE-2026-81777

Vulnerability Analysis

The vulnerability is classified under CWE-290: Authentication Bypass by Spoofing. Essential Addons for Elementor implements CAPTCHA verification as a control against automated submissions and identity spoofing. The plugin fails to properly validate CAPTCHA challenge responses on the server side, allowing an attacker to submit requests that appear to have passed the CAPTCHA check when they have not.

The impact is limited to integrity of the affected functionality. Confidentiality and availability are not directly impacted. However, downstream effects can be significant on sites that rely on Essential Addons forms for login, registration, comments, or lead capture, because the CAPTCHA control becomes ineffective.

Root Cause

The root cause is improper server-side verification of CAPTCHA responses submitted through Essential Addons form widgets. When identity verification depends solely on a client-controlled or improperly validated token, an attacker can craft requests that spoof a successful challenge. Refer to the Patchstack Vulnerability Report for technical detail on the flawed validation path.

Attack Vector

Exploitation occurs over the network against public WordPress endpoints exposed by the plugin. An unauthenticated attacker submits crafted HTTP requests to form-handling routes and bypasses CAPTCHA verification. Automated tooling can weaponize the bypass for credential stuffing, spam submission, or identity spoofing at scale against any site running a vulnerable version of the plugin.

No verified proof-of-concept code is published in the referenced advisory. The Patchstack advisory describes the bypass without releasing exploit code.

Detection Methods for CVE-2026-81777

Indicators of Compromise

Repeated form submissions from the same IP address or user agent bypassing expected CAPTCHA validation delays
HTTP POST requests to Essential Addons form endpoints containing missing, empty, or reused CAPTCHA response tokens
Sudden spikes in successful form submissions from Essential Addons widgets without corresponding CAPTCHA provider verification logs
Anomalous account registrations, comments, or contact form entries originating from automation-linked IP ranges

Detection Strategies

Correlate WordPress access logs with third-party CAPTCHA provider verification logs (Google reCAPTCHA, hCaptcha, Cloudflare Turnstile) to identify form submissions lacking a matching challenge verification
Inspect PHP application logs for calls into Essential Addons form processing functions that complete without corresponding CAPTCHA validation errors
Baseline normal form submission rates per endpoint and alert on statistical deviations that indicate automated abuse

Monitoring Recommendations

Enable verbose logging on WordPress form endpoints exposed by Essential Addons and forward events to a centralized SIEM
Monitor authentication, registration, and comment endpoints for elevated failure-to-success ratios that indicate credential stuffing
Track outbound calls to CAPTCHA verification APIs and alert when form submissions occur without a paired verification request

How to Mitigate CVE-2026-81777

Immediate Actions Required

Identify all WordPress instances running Essential Addons for Elementor and confirm plugin version against 6.8.0 or earlier
Update Essential Addons for Elementor to a version later than 6.8.0 that contains the vendor fix, per the Patchstack Vulnerability Report
Review form submission logs from the past 90 days for evidence of automated abuse or spoofed submissions
Rotate credentials for any accounts created or modified through affected forms during the exposure window

Patch Information

WPDeveloper has addressed the CAPTCHA bypass in versions released after 6.8.0. Administrators should apply the latest available Essential Addons for Elementor release through the WordPress plugin updater or by manually deploying the updated plugin archive. Confirm the fix using the vendor advisory linked from the Patchstack Vulnerability Report.

Workarounds

Temporarily disable Essential Addons form widgets that rely on CAPTCHA verification until the patch is applied
Deploy a Web Application Firewall (WAF) rule to enforce server-side CAPTCHA verification on form submission endpoints
Add secondary anti-automation controls such as IP rate limiting, honeypot fields, or challenge-response headers at the reverse proxy layer
Restrict access to WordPress admin and form endpoints by source IP where operationally feasible

bash

# Example WP-CLI commands to inventory and update the plugin
wp plugin list --name=essential-addons-for-elementor-lite --fields=name,version,status
wp plugin update essential-addons-for-elementor-lite
wp plugin get essential-addons-for-elementor-lite --field=version