CVE-2026-84755 in Mail Mint Plugin
Summary
by MITRE • 09/03/2026
Unauthenticated Broken Access Control in Mail Mint <= 1.31.0 versions.
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Analysis
by VulDB Data Team • 09/03/2026
The vulnerability identified as an unbroken access control issue within Mail Mint versions prior to or equal to 1.31.0 represents a critical failure in the application's security architecture, specifically concerning authentication mechanisms and role-based permissions. This flaw allows attackers who have not yet authenticated themselves against the system to perform actions that should be restricted to authorized users only. In modern web applications and email management systems like Mail Mint, access control is fundamental to maintaining data integrity and confidentiality. When this mechanism fails at an unauthenticated level, it effectively bypasses the primary gatekeeper of the application, exposing sensitive internal functions or administrative interfaces to any external actor with network connectivity to the service. This type of vulnerability is commonly categorized under CWE-287, which describes Improper Authentication, but in this specific context where access control rules are ignored without prior login, it also aligns closely with CWE-862, Missing Authorization. The presence of such a flaw indicates that the server-side logic does not adequately verify whether the requestor possesses valid credentials before processing sensitive requests or rendering protected content.
From an operational perspective, this vulnerability poses severe risks to both individual users and organizational infrastructure depending on how Mail Mint is deployed. If the application handles personal email accounts, attackers could potentially access private correspondence, contact lists, and stored attachments without any form of credential compromise. In enterprise environments where Mail Mint might be integrated with corporate directories or used for internal communications, the impact escalates significantly. Unauthenticated access can lead to data exfiltration, unauthorized modification of mail rules that redirect sensitive information to attacker-controlled servers, or even complete account takeover if subsequent steps allow password resets or configuration changes without proper verification. Furthermore, this weakness often serves as a stepping stone for more complex attacks. An adversary might leverage the unauthenticated endpoint to gather intelligence about the system version, internal network topology, or other users' activities, which can then be used in conjunction with social engineering or further exploitation attempts within the ATT&CK framework under techniques such as Collection from Local System Data or Account Manipulation if privilege escalation is possible.
The technical root cause typically involves a misconfiguration in the web server's routing table or an error in the application code where security middleware designed to enforce authentication checks was either not applied to specific endpoints or incorrectly bypassed by certain request patterns. Developers may have assumed that these routes were only accessible through internal redirects from authenticated pages, failing to account for direct HTTP requests originating from external sources. This oversight creates a blind spot in the defense-in-depth strategy of the application. Security scanners and automated penetration testing tools can easily detect such vulnerabilities by probing endpoints with unauthenticated GET or POST requests and observing responses that indicate successful execution of protected functions rather than returning standard 401 Unauthorized or 302 Redirect to login page status codes. The persistence of this flaw in versions up to 1.31.0 suggests a gap in the secure software development lifecycle, particularly during code review and automated security testing phases where such access control violations should have been identified and remediated before release.
Mitigation strategies must prioritize immediate patching as the primary defense vector. Administrators running Mail Mint version 1.31.0 or earlier are strongly advised to upgrade to a patched version that resolves this specific access control logic error. Until an update is applied, temporary mitigations can include placing the application behind a Web Application Firewall configured with strict rules to block unauthenticated requests to known administrative or sensitive API endpoints. Additionally, implementing network-level restrictions such as IP whitelisting for management interfaces can reduce the attack surface by limiting exposure to trusted networks only. It is also crucial to conduct a thorough audit of all exposed endpoints within the application to ensure that no other routes suffer from similar authorization flaws. Long-term remediation involves adopting secure coding practices that enforce explicit access control checks on every request, utilizing established frameworks for authentication and authorization rather than custom implementations which are prone to logical errors. Regular penetration testing and static code analysis should be integrated into the deployment pipeline to catch such misconfigurations early in the development process, ensuring that future releases maintain robust security postures aligned with industry best practices like OWASP Top 10 guidelines regarding broken access control.