CVE-2024-53994 in Discourse
Summary
by MITRE • 02/05/2025
Discourse is an open source platform for community discussion. In affected versions users who disable chat in preferences could still be reachable in some cases. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should disable the chat plugin within site settings.
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Analysis
by VulDB Data Team • 09/26/2025
CVE-2024-53994 represents a privilege escalation vulnerability within the Discourse community discussion platform that undermines the intended access controls for user communication preferences. This vulnerability specifically affects the chat functionality within the platform where users who have explicitly disabled chat in their personal preferences can still remain reachable through certain pathways within the system. The flaw exists in the configuration management and access control mechanisms that govern how user preferences interact with the platform's chat infrastructure. This issue falls under the category of improper access control as defined by CWE-285, where the system fails to properly enforce user-defined privacy settings that should prevent communication with disabled users.
The technical implementation of this vulnerability stems from a failure in the platform's permission model where disabling chat preferences does not effectively propagate throughout all communication channels within the application. When users disable chat in their preferences, the system should ensure that no communication pathways remain active for those users, yet certain conditions allow chat reachability to persist. This represents a breakdown in the principle of least privilege where users maintain unintended access to communication features despite their explicit preferences. The vulnerability can be exploited by malicious actors who attempt to bypass user privacy controls, potentially leading to unwanted communication or harassment of users who have specifically disabled chat functionality. The issue demonstrates a lack of proper input validation and access control enforcement as outlined in the ATT&CK framework under privilege escalation techniques.
The operational impact of CVE-2024-53994 extends beyond simple privacy concerns to potentially compromise user safety and platform integrity. Users who disable chat functionality typically do so for legitimate reasons including avoiding unwanted interactions or protecting their privacy, but this vulnerability allows those preferences to be circumvented. This creates a risk environment where users may experience persistent unwanted communication even after taking steps to disable chat features. The vulnerability affects the core user experience and trust in the platform's ability to respect user preferences, potentially leading to user attrition and reputational damage. Organizations relying on Discourse for community management may face compliance issues if they cannot ensure proper handling of user communication preferences, particularly in regulated environments where privacy controls are mandatory.
Organizations affected by this vulnerability should prioritize immediate remediation through upgrading to the latest stable version of Discourse where the patch has been implemented. The patch addresses the core access control flaw by ensuring that when users disable chat preferences, all communication pathways are properly disabled throughout the platform. For environments where immediate upgrading is not feasible, administrators should disable the chat plugin entirely through site settings as a temporary mitigation measure. This approach effectively removes the vulnerable functionality from the platform until a proper upgrade can be completed. The vulnerability highlights the importance of proper security testing of user preference systems and access control mechanisms, particularly in community platforms where user privacy controls are fundamental to maintaining trust and safe communication environments. Security teams should conduct thorough testing of all user preference settings to ensure that disabling features properly removes all associated access pathways and that proper input validation is implemented across all communication channels within the application.