CVE-2025-8927 in mblog
Summary
by MITRE • 08/13/2025
A vulnerability was determined in mtons mblog up to 3.5.0. Affected by this issue is some unknown functionality of the file /email/send_code of the component Verification Code Handler. The manipulation of the argument email leads to improper restriction of excessive authentication attempts. The attack may be launched remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 08/27/2025
The vulnerability identified as CVE-2025-8927 affects the mtons mblog platform version 3.5.0 and earlier, specifically targeting the email verification code handler component. This issue resides within the file /email/send_code which is responsible for managing authentication verification processes. The flaw manifests when the email argument is manipulated, creating a scenario where the system fails to properly enforce rate limiting or authentication attempt restrictions. The vulnerability represents a significant security weakness in the platform's authentication mechanism, potentially allowing unauthorized users to exploit the system's verification process.
The technical implementation of this vulnerability stems from inadequate input validation and insufficient rate limiting controls within the verification code handler. When an attacker manipulates the email parameter, the system does not properly restrict the number of authentication attempts that can be made within a given time period. This failure directly relates to CWE-305 authentication bypass weaknesses and represents a classic example of insufficient account lockout or throttling mechanisms. The attack vector is remote, meaning that malicious actors can exploit this vulnerability without requiring physical access to the system or direct network interaction with the server.
The operational impact of CVE-2025-8927 extends beyond simple authentication bypass scenarios, potentially enabling account enumeration attacks, brute force attempts, and denial of service conditions. Attackers could systematically test multiple email addresses to determine which accounts exist within the system while simultaneously attempting to overwhelm the verification system with excessive requests. This vulnerability aligns with ATT&CK technique T1110.003 for credential stuffing and password spraying attacks, as it allows for automated attempts to validate email addresses and potentially compromise user accounts through repeated verification requests. The high attack complexity and difficulty of exploitation suggest that while the vulnerability exists, it requires sophisticated techniques to successfully compromise the system.
Mitigation strategies for CVE-2025-8927 should focus on implementing robust rate limiting controls, enforcing strict input validation, and establishing proper account lockout mechanisms. Organizations should deploy time-based throttling for verification code requests, implement CAPTCHA systems for automated request detection, and establish maximum attempt limits per IP address or email address. The solution must address the underlying CWE-305 weakness by ensuring that authentication systems properly handle excessive attempts through proper session management and account protection mechanisms. Additionally, monitoring and logging of verification code requests should be enhanced to detect anomalous behavior patterns that could indicate exploitation attempts. Given that the exploit has been disclosed and is publicly available, immediate remediation is essential to protect user accounts and prevent potential data breaches.