CVE-2006-5729 in Yazd Discussion Forum
Summary
by MITRE
Yazd Discussion Forum before 3.0 beta does not properly manage forum permissions, which allows remote authenticated users to (1) reply to a message in an arbitrary forum, if authorized to create a message in any forum; and (2) perform certain unauthorized forum actions, related to an "error in how the permissions were assembled" that assigns extra permissions to users.
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Analysis
by VulDB Data Team • 04/26/2026
The vulnerability described in CVE-2006-5729 represents a critical access control flaw within the Yazd Discussion Forum software prior to its 3.0 beta release. This issue stems from improper permission management mechanisms that fundamentally compromise the security model of the platform. The flaw manifests as a privilege escalation vulnerability where authenticated users can exploit misconfigured permission sets to gain unauthorized access to forum functionalities beyond their intended scope. The vulnerability specifically affects the permission assembly logic, creating a scenario where users receive unintended additional privileges through flawed permission aggregation processes. This type of vulnerability falls under the category of inadequate access control as defined by CWE-284, which addresses improper access control mechanisms in software systems.
The technical implementation of this vulnerability occurs when the forum system fails to properly validate user permissions during message handling operations. An authenticated user who possesses the basic capability to create messages in any forum can leverage this weakness to reply to messages in forums where they should not have access. Additionally, the flawed permission assembly process creates a broader scope of unauthorized actions that users can perform within the forum environment. The root cause lies in how the system aggregates and assigns permissions, where the error in permission assembly results in users being granted additional capabilities that exceed their legitimate access rights. This permission mismanagement creates a pathway for users to bypass intended security boundaries and access restricted forum functionalities.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data exposure and forum integrity compromise. Remote authenticated users can manipulate forum content by replying to messages in restricted forums, potentially leading to information disclosure or malicious content injection. The unauthorized forum actions that result from this permission error can include accessing private discussions, modifying forum settings, or performing administrative functions that should be restricted to authorized personnel only. This vulnerability particularly affects collaborative environments where forum administrators rely on proper access controls to maintain data confidentiality and system integrity. The consequences can range from minor privacy violations to more serious security incidents depending on the forum's sensitivity and the specific actions users can perform with their elevated privileges.
Mitigation strategies for this vulnerability require immediate implementation of proper permission validation mechanisms within the forum software. System administrators should ensure that all versions prior to 3.0 beta are upgraded to the patched release that addresses the permission assembly error. The fix typically involves correcting the permission aggregation logic to properly validate user access rights before allowing forum operations. Organizations should implement regular security assessments of their forum platforms to identify similar permission management flaws that could create analogous vulnerabilities. Additionally, access control reviews should be conducted to verify that permission assignments follow the principle of least privilege, ensuring users only receive the minimum necessary permissions for their legitimate forum activities. This vulnerability highlights the importance of proper access control design and the potential consequences of inadequate permission validation in collaborative software platforms, aligning with ATT&CK technique T1078 for valid accounts and T1566 for credential harvesting through social engineering attacks that could exploit such flaws.