CVE-2026-3020 in Application Web
Summary
by MITRE • 03/16/2026
Identity based authorization bypass vulnerability (IDOR) that allows an attacker to modify the data of a legitimate user account, such as changing the victim's email address, validating the new email address, and requesting a new password. This could allow them to take complete control of other users' legitimate accounts
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Analysis
by VulDB Data Team • 05/19/2026
This vulnerability represents a critical identity-based authorization bypass flaw that fundamentally undermines the security of user account management systems. The issue stems from insufficient access control mechanisms that fail to properly validate user permissions when processing requests to modify account data. Attackers can exploit this weakness to manipulate the account information of legitimate users without proper authentication or authorization, creating a pathway for complete account takeover. The vulnerability specifically affects the validation and modification processes for user email addresses, which serves as a critical attack vector since email addresses are often used for password recovery and account verification. This type of flaw directly maps to common weakness enumerations identified in the CWE database under category 862, which describes insufficient authorization vulnerabilities. The operational impact extends beyond simple data modification as attackers can leverage the compromised email addresses to initiate password reset procedures, effectively gaining persistent access to victim accounts. From an attack framework perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK matrix under the credential access and privilege escalation domains, where adversaries seek to maintain long-term access through account compromise.
The technical implementation of this vulnerability typically involves predictable user identifiers or insufficient session validation during account modification requests. Attackers can craft requests that target specific user account identifiers without proper authorization checks, allowing them to modify email addresses, validate these changes, and subsequently request password resets for accounts they do not own. The flaw often manifests in systems where user account modification endpoints do not properly verify that the requesting user has legitimate authorization to modify the target account. This type of authorization bypass frequently occurs in applications that rely on user identifiers such as user IDs, email addresses, or account numbers without implementing proper access control validation. The vulnerability can be exploited through various means including direct api calls, web application manipulation, or by leveraging session tokens that may not properly enforce authorization boundaries.
The implications of this vulnerability extend far beyond immediate account compromise, as it enables attackers to establish persistent access to victim accounts and potentially escalate their privileges within the system. Successful exploitation allows threat actors to intercept all communications, access sensitive data, and perform unauthorized transactions using legitimate user credentials. The impact is particularly severe because email addresses are commonly used as recovery mechanisms, making the vulnerability a critical entry point for broader system compromise. Organizations may experience significant reputational damage, regulatory compliance violations, and potential financial losses due to unauthorized access to user accounts. The vulnerability also creates opportunities for attackers to conduct further reconnaissance and lateral movement within the network, as compromised accounts often provide access to additional system resources and data. Security professionals should consider this vulnerability as a potential stepping stone for more sophisticated attacks, including data exfiltration, system infiltration, and credential theft operations. The lack of proper authorization checks creates an environment where attackers can systematically compromise multiple user accounts, potentially leading to widespread system access and data breaches.
Mitigation strategies should focus on implementing robust access control mechanisms that validate user permissions before allowing any account modifications. Organizations must ensure that all account management operations include proper authorization checks that verify the requesting user has legitimate rights to modify the target account. This includes implementing proper session validation, token-based authentication, and role-based access controls that prevent unauthorized modifications. Security measures should include input validation to prevent predictable user identifier exploitation, proper logging and monitoring of account modification activities, and implementing rate limiting to prevent automated exploitation attempts. Additionally, organizations should establish multi-factor authentication requirements for account modifications, implement proper account recovery processes that verify user identity through multiple channels, and conduct regular security testing to identify and remediate similar authorization bypass vulnerabilities. The implementation of defense-in-depth strategies, including network segmentation, access control lists, and comprehensive audit trails, provides additional layers of protection against exploitation of such authorization flaws. Organizations should also consider implementing automated security scanning tools that can identify similar patterns of insufficient authorization checks across their applications and systems.