CVE-2025-28104 in flaskBlog
Summary
by MITRE • 04/21/2025
Incorrect access control in laskBlog v2.6.1 allows attackers to access all usernames via a crafted input.
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Analysis
by VulDB Data Team • 05/25/2025
The vulnerability identified as CVE-2025-28104 represents a critical access control flaw within the laskBlog v2.6.1 web application that exposes user authentication data through improper input validation mechanisms. This issue manifests when attackers submit crafted input parameters that bypass intended authorization checks, resulting in unauthorized access to the complete user directory. The vulnerability stems from insufficient validation of user inputs within the application's authentication and user management components, creating a pathway for malicious actors to enumerate all registered usernames without proper authentication credentials.
The technical implementation of this flaw involves the application's failure to properly sanitize or validate input parameters that are processed within user enumeration functions. When legitimate user input is processed through the application's backend systems, the lack of proper input filtering allows attackers to manipulate query parameters or request structures to retrieve user information. This weakness aligns with CWE-284, which addresses improper access control mechanisms, and represents a classic case of insufficient input validation that enables unauthorized data disclosure. The vulnerability operates at the application layer where user authentication and authorization controls should enforce strict access boundaries but instead permit arbitrary username enumeration through malformed requests.
The operational impact of this vulnerability extends beyond simple username enumeration to potentially enable more sophisticated attack vectors including credential stuffing, account takeover attempts, and social engineering campaigns. Attackers can leverage the exposed usernames to target specific individuals with phishing emails or to conduct targeted brute force attacks against known user accounts. This vulnerability directly impacts the confidentiality and integrity of user authentication data, creating a foundation for further exploitation and compromising the overall security posture of the affected system. The exposure of user credentials through this vulnerability can lead to cascading security incidents where compromised accounts serve as entry points for broader network infiltration attempts.
Security mitigations for CVE-2025-28104 should focus on implementing robust input validation and sanitization mechanisms within the application's user management functions. The recommended approach involves enforcing strict parameter validation on all user input, implementing proper access control checks before any user enumeration requests are processed, and applying rate limiting to prevent automated enumeration attacks. Organizations should also consider implementing proper error handling that does not disclose sensitive information in response messages, as well as regular security testing and code reviews to identify similar vulnerabilities. The remediation strategy should align with ATT&CK framework techniques related to credential access and privilege escalation, ensuring that the fix addresses both the immediate vulnerability and prevents similar issues in other application components. Additionally, implementing proper logging and monitoring of user enumeration attempts can help detect and respond to potential exploitation attempts.