CVE-2026-3020: Authentication Bypass Vulnerability

CVE-2026-3020 Overview

CVE-2026-3020 is an Insecure Direct Object Reference (IDOR) vulnerability that enables attackers to bypass identity-based authorization controls and modify legitimate user account data. This flaw allows malicious actors to change a victim's email address, validate the new email, and request a password reset—ultimately leading to complete account takeover.

Critical Impact

Attackers can gain full control of legitimate user accounts by manipulating account identifiers, enabling unauthorized email changes and password resets.

Affected Products

• Wakyma Application Web (specific versions not disclosed)

Discovery Timeline

• 2026-03-16 - CVE-2026-3020 published to NVD
• 2026-03-16 - Last updated in NVD database

Technical Details for CVE-2026-3020

Vulnerability Analysis

This vulnerability is classified as CWE-639 (Authorization Bypass Through User-Controlled Key), commonly known as an Insecure Direct Object Reference (IDOR). The flaw exists in the application's authorization logic, which fails to properly validate whether the authenticated user has permission to modify the requested resource.

The attack is network-accessible and requires low privileges to exploit, meaning an attacker only needs a valid low-level account to begin targeting other users. The vulnerability does not require user interaction, making it particularly dangerous as attacks can be automated at scale.

When successfully exploited, the attacker can achieve high confidentiality and integrity impact by accessing and modifying sensitive user data. This includes the ability to change email addresses on victim accounts, which serves as the foundation for a complete account takeover attack chain.

Root Cause

The root cause of CVE-2026-3020 is improper authorization validation in user account management endpoints. The application accepts user-controlled identifiers (such as user IDs or account references) without adequately verifying that the requesting user has authorization to modify the specified account. This allows authenticated users to manipulate these identifiers to reference and modify other users' accounts.

Attack Vector

The attack exploits the network-accessible API endpoints responsible for account management. An attacker with low-level authenticated access can manipulate user identifiers in API requests to target victim accounts. The attack chain typically follows this sequence:

1. Attacker authenticates with their own valid account credentials
2. Attacker intercepts or crafts requests to account modification endpoints
3. Attacker replaces their own user identifier with a victim's identifier
4. Application processes the request without proper authorization checks
5. Attacker changes the victim's email address to one they control
6. Attacker validates the new email address through the confirmation process
7. Attacker initiates a password reset, receiving the reset link at their controlled email
8. Attacker gains complete control of the victim's account

The vulnerability does not require any interaction from the victim and can be exploited entirely through manipulated API calls. For detailed technical information, see the INCIBE Security Notice.

Detection Methods for CVE-2026-3020

Indicators of Compromise

• Unusual patterns of account email address changes, particularly multiple changes in short time periods
• Password reset requests immediately following email address modifications
• API requests with mismatched user identifiers between authentication tokens and request parameters
• Single source IP addresses or sessions modifying multiple distinct user accounts

Detection Strategies

• Implement logging and alerting for all account modification operations, correlating the authenticated user with the target account
• Monitor for sequential or automated attempts to access different user identifiers from the same session
• Deploy web application firewalls (WAF) with rules to detect parameter manipulation patterns
• Analyze API access logs for requests where the authenticated user ID differs from the resource user ID being modified

Monitoring Recommendations

• Enable detailed audit logging for all user account management endpoints
• Configure real-time alerts for email address changes followed by password reset requests
• Implement anomaly detection for unusual account modification patterns
• Monitor for automated enumeration attempts against user identifiers

How to Mitigate CVE-2026-3020

Immediate Actions Required

• Review and audit all API endpoints that accept user identifiers to ensure proper authorization checks are implemented
• Implement server-side validation that verifies the authenticated user has explicit permission to modify the requested resource
• Add rate limiting on account modification endpoints to slow automated exploitation attempts
• Consider temporarily restricting email change functionality while implementing fixes

Patch Information

Consult the INCIBE Security Notice for vendor-specific patch information and updates regarding the Wakyma Application Web.

Workarounds

• Implement additional verification steps for sensitive account changes, such as requiring current password confirmation
• Add email verification to the original email address before allowing address changes
• Deploy compensating controls through WAF rules to detect and block IDOR attack patterns
• Implement session-based authorization checks that validate resource ownership on every request