CVE-2026-22430: Verdure Theme Authorization Bypass Flaw

CVE-2026-22430 Overview

CVE-2026-22430 is an Insecure Direct Object Reference (IDOR) vulnerability in the Mikado-Themes Verdure WordPress theme. The flaw stems from improper access control validation that allows authenticated users to manipulate user-controlled keys to access resources belonging to other users. The vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key. It affects all versions of Verdure up to and including 1.6. An attacker with low-privilege authenticated access can exploit incorrectly configured access control levels over the network without user interaction.

Critical Impact

Authenticated attackers can bypass authorization checks to access or modify resources belonging to other users, leading to limited data integrity and availability impact.

Affected Products

• Mikado-Themes Verdure WordPress Theme
• All versions from n/a through 1.6
• WordPress sites deploying the Verdure theme

Discovery Timeline

• 2026-01-22 - CVE CVE-2026-22430 published to NVD
• 2026-04-28 - Last updated in NVD database

Technical Details for CVE-2026-22430

Vulnerability Analysis

The Verdure theme contains an Insecure Direct Object Reference (IDOR) weakness. The application exposes object identifiers in request parameters without verifying that the requesting user owns or has permission to access the referenced object. An authenticated user with low privileges can substitute identifier values in requests to access or operate on resources belonging to other accounts.

The attack vector is network-based, requires low privileges, and does not require user interaction. Exploitation yields no confidentiality impact but produces limited integrity and availability impact on affected objects. The EPSS data indicates a low probability of near-term exploitation activity.

Root Cause

The root cause is missing or inadequate authorization checks tied to user-supplied identifiers. The theme accepts object keys (such as post IDs, user IDs, or resource identifiers) from request parameters and performs operations without confirming the authenticated session is authorized to act on that key. This pattern aligns with CWE-639.

Attack Vector

An attacker authenticates to the WordPress site as a low-privileged user, such as a subscriber or contributor. The attacker enumerates or guesses identifier values used by Verdure theme endpoints. By submitting modified identifiers in HTTP requests, the attacker accesses or modifies records belonging to other users. Refer to the Patchstack Vulnerability Report for additional technical context.

Detection Methods for CVE-2026-22430

Indicators of Compromise

• Unusual HTTP request patterns containing sequential or enumerated identifier values in Verdure theme endpoints
• Authenticated requests from low-privilege accounts accessing or modifying resources outside their ownership scope
• Unexpected modifications to user profile data, posts, or theme-managed resources without corresponding administrative activity

Detection Strategies

• Review WordPress access logs for repeated requests to the same endpoint with varying identifier parameters
• Correlate authenticated session activity with resource ownership records to detect cross-account access
• Deploy a Web Application Firewall (WAF) rule that flags IDOR-style parameter manipulation against Verdure theme paths

Monitoring Recommendations

• Enable verbose WordPress audit logging for theme-handled requests and capture authenticated user IDs alongside target object IDs
• Monitor for privilege escalation attempts or data exfiltration patterns from subscriber-level accounts
• Alert on bulk identifier enumeration patterns originating from a single authenticated session

How to Mitigate CVE-2026-22430

Immediate Actions Required

• Identify all WordPress sites running the Verdure theme version 1.6 or earlier
• Restrict registration of new low-privileged accounts until a patched version is applied
• Audit existing user accounts for unauthorized changes to profile data and theme-managed resources

Patch Information

No fixed version is listed in the available CVE data at the time of publication. Site administrators should consult the Patchstack Vulnerability Report and the Mikado-Themes vendor channels for an updated theme release addressing the IDOR flaw.

Workarounds

• Replace the Verdure theme with a maintained alternative if no patched version is available
• Apply virtual patching at the WAF layer to block requests that manipulate object identifiers in Verdure theme endpoints
• Enforce least-privilege account policies and disable open user registration where feasible

# Example WAF rule (ModSecurity) to flag IDOR parameter tampering on Verdure endpoints
SecRule REQUEST_URI "@contains /wp-content/themes/verdure/" \
    "id:1002630,phase:2,deny,status:403,log,\
     msg:'Potential IDOR on Verdure theme endpoint',\
     chain"
    SecRule ARGS_NAMES "@rx (id|user_id|post_id|key)" \
        "chain"
        SecRule ARGS "@rx ^[0-9]+$" \
            "t:none"