CVE-2026-110105 in Symphony
Summary
by MITRE • 10/13/2026
B3log Symphony through 3.6.4 contains a missing authorization vulnerability that allows unauthenticated attackers to reach admin routes because PermissionMidware.check permits routes lacking permission.rule.url entries. Attackers can request /admin/report/ignore/{reportId}, /admin/tags/remove-unused, or /admin/user/{userId}/init-point to ignore reports, delete unused tags, or grant points without audit logging.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified in B3log Symphony versions through 3.6.4 represents a critical failure in access control mechanisms, specifically categorized under CWE-285: Improper Authorization. This flaw stems from the design of the PermissionMidware component, which is responsible for validating user permissions before allowing execution of administrative functions. The middleware operates by checking if a requested route has an associated permission.rule.url entry to determine authorization status. However, this logic contains a significant oversight where routes that lack such entries are implicitly permitted without further verification of the caller's identity or privileges. This architectural decision effectively creates a blind spot in the security perimeter, allowing unauthenticated actors to bypass intended restrictions and interact with sensitive administrative endpoints directly through HTTP requests.
The operational impact of this vulnerability is severe due to the nature of the exposed routes. Attackers can exploit specific API endpoints such as /admin/report/ignore/{reportId}, which allows them to suppress or ignore user-generated reports without authorization, thereby undermining community moderation efforts and potentially allowing harmful content to persist on the platform. Additionally, the endpoint /admin/tags/remove-unused enables unauthorized deletion of system tags, which can disrupt site organization and metadata integrity. Most critically, the route /admin/user/{userId}/init-point permits attackers to grant points or privileges to user accounts without any audit logging. This lack of accountability means that malicious actors can escalate their own permissions or those of accomplices silently, facilitating further attacks such as data exfiltration, defacement, or complete system compromise with no trace in standard logs for forensic analysis.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK technique T1078: Valid Accounts, although it is exploited by unauthenticated users due to the broken access control logic rather than stolen credentials. The exploitation path typically involves crafting direct HTTP requests to the identified endpoints, often using tools like curl or custom scripts that do not require a valid session token because the middleware fails to enforce authentication checks for routes missing specific permission rules. This behavior indicates a fundamental misunderstanding of the principle of least privilege and secure default configurations in the application's security architecture.
To mitigate this vulnerability, immediate action is required to patch B3log Symphony to version 3.6.5 or later where these authorization gaps have been addressed. In environments where upgrading is not immediately feasible, administrators should implement a web application firewall rule set that explicitly blocks access to the identified administrative paths from unauthenticated sources. Furthermore, it is crucial to review all middleware configurations to ensure that no route can be accessed without explicit permission checks and that audit logging is enabled for all administrative actions to maintain accountability and facilitate incident response if exploitation occurs.