CVE-2024-49765 in Discourse
Summary
by MITRE • 12/19/2024
Discourse is an open source platform for community discussion. Sites that are using discourse connect but still have local logins enabled could allow attackers to bypass discourse connect to create accounts and login. This problem is patched in the latest version of Discourse. Users unable to upgrade who are using discourse connect may disable all other login methods as a workaround.
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Analysis
by VulDB Data Team • 08/26/2025
CVE-2024-49765 represents a critical authentication bypass vulnerability within the Discourse open source community discussion platform that directly impacts user account creation and access control mechanisms. This vulnerability specifically affects instances where Discourse Connect is implemented alongside local login capabilities, creating a security gap that allows unauthorized actors to circumvent the intended authentication flow. The flaw enables attackers to exploit the system by creating accounts and logging in without properly utilizing the Discourse Connect authentication framework, which is designed to centralize and secure user authentication across connected platforms. The vulnerability stems from improper validation of authentication requests when multiple login methods are enabled simultaneously, allowing malicious users to bypass the Connect authentication process entirely.
The technical implementation of this vulnerability aligns with CWE-287, which addresses improper authentication mechanisms within software systems, and represents a classic case of authentication bypass through flawed access control enforcement. When Discourse Connect is enabled but local login methods remain active, the platform fails to properly validate whether authentication requests should be processed through the Connect framework or allowed through local credentials. This creates an exploitable condition where attackers can leverage the local login functionality to establish accounts and gain access to the system, effectively neutralizing the security benefits that Discourse Connect was designed to provide. The flaw demonstrates poor separation of authentication pathways and inadequate session management between different login mechanisms within the same platform instance.
The operational impact of CVE-2024-49765 extends beyond simple unauthorized access to encompass potential account takeover scenarios, data integrity compromises, and escalation of privileges within the community platform. Attackers exploiting this vulnerability can create persistent user accounts with varying permission levels, potentially leading to content manipulation, spam distribution, or even administrative access if proper privilege controls are not in place. The vulnerability affects the core security model of Discourse Connect, which is specifically designed to prevent such bypass scenarios by centralizing authentication through external identity providers. Organizations relying on Discourse for community management, customer support forums, or collaborative platforms face significant risk of unauthorized participation and content tampering. The impact is particularly severe for platforms that depend on Discourse Connect for integration with enterprise identity management systems or single sign-on environments.
Organizations affected by CVE-2024-49765 should immediately implement the recommended mitigations as outlined in the vendor patch. The primary solution involves upgrading to the latest version of Discourse where the vulnerability has been addressed through proper authentication flow enforcement and validation of login method selection. For environments unable to perform immediate upgrades, the workaround of disabling all non-Connect login methods provides an effective temporary solution that maintains the integrity of the authentication framework. This mitigation aligns with ATT&CK technique T1078 which addresses valid accounts and credential access, as it prevents attackers from leveraging unauthorized authentication paths. Security teams should also conduct comprehensive audits of their Discourse configurations to ensure that only intended authentication methods remain enabled and that proper access controls are in place to prevent unauthorized account creation. The vulnerability serves as a reminder of the importance of proper authentication design and the potential risks associated with maintaining multiple authentication mechanisms without proper validation controls between them.