CVE-2026-93870 in Cotonti
Summary
by MITRE • 09/18/2026
Cotonti through 1.0.0 fails to validate anti-CSRF tokens in the ratings plugin AJAX handler, allowing attackers to forge ratings on behalf of authenticated users. Attackers can craft malicious pages that auto-submit POST requests to modify stored rating data when visited by logged-in users.
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Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified in Cotonti versions up to 1.0.0 represents a critical failure in session management and request validation mechanisms, specifically within the ratings plugin's AJAX handler. This flaw is classified under CWE-352, which denotes Cross-Site Request Forgery (CSRF), where an application fails to verify that incoming requests originate from legitimate users who intended to perform those actions. In this specific instance, the system does not validate anti-CSRF tokens for state-changing operations executed via AJAX calls. This omission allows malicious actors to bypass standard security controls designed to prevent unauthorized command execution on behalf of authenticated users. The absence of these tokens means that any POST request sent to the affected endpoint is processed as valid if it originates from a session with active authentication, regardless of whether the user explicitly initiated the action or was tricked into doing so by an external party.
The operational impact of this vulnerability centers on the ability of attackers to forge ratings for content within the Cotonti platform. By crafting malicious web pages that automatically submit POST requests to the vulnerable AJAX endpoint when visited by a logged-in user, adversaries can manipulate stored rating data without the victim's knowledge or consent. This capability undermines the integrity of community-driven features such as reviews, likes, or star ratings, which are often used for content curation and reputation management. An attacker could artificially inflate the visibility of specific items to promote them or deflate scores for competitors through malicious defacement campaigns. Furthermore, because this is an AJAX-based attack, it can be executed silently in the background without requiring user interaction beyond visiting a compromised page, making detection difficult for end-users who may remain unaware that their session has been exploited.
From a threat modeling perspective, this vulnerability aligns with MITRE ATT&CK technique T1534, which covers Cross-Site Request Forgery. The attack vector relies on social engineering or drive-by tactics to lure authenticated users into triggering the malicious payload. Once triggered, the attacker gains the ability to modify application state through HTTP POST requests that appear legitimate due to the presence of valid session cookies but lack proper cryptographic proof of intent via anti-CSRF tokens. This type of vulnerability is particularly dangerous in web applications where user-generated content and reputation systems are central to functionality, as it erodes trust in the platform's data integrity. The exploitation does not require high privileges or complex setup; a simple HTML page with an auto-submitting form targeting the vulnerable endpoint is sufficient for successful execution against any authenticated visitor.
Mitigation strategies must focus on implementing robust request validation mechanisms immediately. Developers should integrate anti-CSRF tokens into all state-changing AJAX endpoints, ensuring that each POST request includes a unique, unpredictable token tied to the user's session and validated server-side before processing. Additionally, applying the SameSite cookie attribute with strict or lax settings can provide an additional layer of defense by preventing browsers from sending cookies in cross-site requests where appropriate. Regular security audits should also be conducted to identify other endpoints that may suffer from similar validation gaps. For administrators using Cotonti 1.0.0 and earlier versions, upgrading to a patched release is the most effective remediation step available. Until an update is applied, deploying Web Application Firewalls with CSRF detection capabilities can help mitigate exploitation by blocking suspicious request patterns based on behavioral analysis rather than just signature matching.