CVE-2026-37107 in HTMLy
Summary
by MITRE • 10/13/2026
An issue in HTMLy v.3.1.1 allows a remote attacker to escalate privileges via the get_feed function in the admin.php component
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified in HTMLy version 3.1.1 represents a critical security flaw within its administrative interface, specifically located in the get_feed function of the admin.php script. This issue stems from an improper restriction on access control mechanisms, allowing unauthenticated or low-privileged remote attackers to execute actions that should be restricted to authorized administrators. The core technical failure lies in the application's inability to properly validate user session states and permissions before processing requests directed at administrative endpoints. By exploiting this weakness, an attacker can bypass standard authentication checks, effectively gaining unauthorized access to sensitive backend functionalities without valid credentials.
From a technical perspective, the flaw is categorized under CWE-285: Improper Authorization, which describes situations where an application does not properly verify that a user has the necessary permissions for a requested action. In this specific instance, the get_feed function likely processes input parameters or session tokens with insufficient scrutiny. If the server-side logic fails to cross-reference the incoming request against a verified list of active administrator sessions, it may proceed to execute administrative commands or expose sensitive data structures intended only for internal use. This type of vulnerability is often associated with Broken Access Control (CWE-639), where the software does not enforce proper separation between different user roles and privileges.
The operational impact of this privilege escalation is severe, as it compromises the integrity and confidentiality of the entire web application environment. An attacker who successfully exploits this flaw can assume the role of an administrator, granting them full control over the content management system. This includes the ability to modify website configurations, inject malicious code into published articles, create new administrative accounts for persistent access, or delete critical data. In a broader context, such compromise can lead to defacement, distribution of malware to site visitors through injected scripts, and potential pivoting attacks against other systems within the same network infrastructure if server-side features allow further exploitation.
This vulnerability aligns with several tactics in the MITRE ATT&CK framework, particularly Initial Access techniques involving Valid Accounts or Exploitation for Credential Access, as well as Persistence mechanisms like Account Manipulation. Attackers often leverage such flaws to establish a foothold within an organization's digital assets. The lack of robust session management and role-based access control enforcement highlights a significant gap in the application security lifecycle during development and testing phases.
To mitigate this risk, immediate remediation steps should focus on implementing strict server-side validation for all administrative requests. Developers must ensure that every call to admin.php verifies not only the presence of a valid session but also explicitly checks against an authorized list of administrator user IDs or roles before executing any logic within functions like get_feed. Additionally, integrating multi-factor authentication and enforcing secure cookie attributes such as HttpOnly and Secure flags can reduce the attack surface for session hijacking attempts that might accompany this vulnerability. Regular security audits and static code analysis tools configured to detect authorization bypasses are essential preventive measures against similar flaws in future updates or related software components.