CVE-2026-95685 in MISP
Summary
by MITRE • 09/22/2026
MISP contains an access control flaw in the EventReports functionality. The replaceSuggestionInReport action, which allows modification of suggestion content within an event report, was incorrectly mapped to the wildcard permission ('*') in the ACLComponent, making it accessible to any authenticated user regardless of their assigned permissions. All analogous report-modification actions correctly required the perm_add permission, while read-only actions such as downloadAsPDF appropriately used the wildcard.
An authenticated user without the perm_add permission could invoke the replaceSuggestionInReport endpoint to alter report suggestion data, violating the intended authorization model.
This constitutes an improper authorization weakness that could lead to unauthorized modification of event report content, potentially corrupting shared threat intelligence data or injecting misleading information into reports relied upon by other analysts and automated consumers.
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Analysis
by VulDB Data Team • 09/22/2026
The vulnerability identified in MISP represents a critical failure in the application's access control logic within the EventReports functionality. Specifically, the replaceSuggestionInReport action was incorrectly configured to map against the wildcard permission symbol rather than requiring specific elevated privileges. In standard security architectures for threat intelligence platforms like MISP, actions that modify data should require explicit write permissions such as perm_add or equivalent roles granting modification rights. However, in this instance, the system treated a destructive update operation with the same permissive access level as read-only operations, which are legitimately assigned to all authenticated users via wildcard mappings. This misconfiguration effectively bypasses the intended role-based access control model, allowing any user who can successfully authenticate to the platform to execute state-changing commands that they should not be authorized to perform.
From a technical perspective, this flaw constitutes an improper authorization weakness where the application fails to enforce proper restrictions on authenticated users. The vulnerability allows for unauthorized modification of event report content because the backend validation logic does not adequately check whether the requesting user possesses the necessary permissions before processing the request. This discrepancy between read and write operations highlights a systemic inconsistency in how ACL components are applied across different endpoints within the same module. While other analogous actions correctly enforced permission checks, this specific endpoint remained exposed due to the erroneous wildcard assignment, creating an exploitable gap that undermines the integrity of the platform's security posture.
The operational impact of this vulnerability is significant for organizations relying on MISP for collaborative threat intelligence sharing. Event reports often contain curated analysis and suggestions derived from multiple sources, serving as a trusted source of truth for analysts and automated consumption systems. An attacker with low-level access could alter these suggestions to inject misleading information or corrupt existing data. This not only degrades the quality and reliability of shared indicators but also risks propagating false positives or malicious narratives across the entire community using the platform. Such tampering can lead to incorrect incident response decisions, wasted resources investigating non-existent threats, or the suppression of genuine threat activity depending on how the modified suggestions are interpreted by downstream tools.
This issue aligns with CWE-269 Improper Privilege Management and falls under MITRE ATT&CK technique T1078 Valid Accounts, as exploitation requires valid authentication but abuses those credentials to perform unauthorized actions. To mitigate this risk, immediate remediation involves correcting the ACL mapping for the replaceSuggestionInReport action to require appropriate write permissions such as perm_add or specific role-based access controls that restrict modification capabilities to authorized personnel only. Additionally, a comprehensive audit of other endpoints within the EventReports module should be conducted to ensure no similar misconfigurations exist where wildcard permissions are inappropriately applied to state-changing operations. Implementing strict input validation and ensuring consistent permission checks across all API actions will restore the integrity of the authorization model and prevent unauthorized data manipulation.