Summary
phpMyFAQ contains an authorization bypass that may let category-restricted editors manage attachments associated with FAQs outside their permitted categories. An attacker with medium-level editor access could supply another FAQ record or attachment identifier to upload or delete files without the required category authorization.
phpMyFAQ contains an authorization bypass that may let category-restricted editors manage attachments associated with FAQs outside their permitted categories. An attacker with medium-level editor access could supply another FAQ record or attachment identifier to upload or delete files without the required category authorization.
Affected context
The issue may arise in phpMyFAQ deployments where editors are restricted to selected FAQ categories but attachment management requests rely on client-supplied record or attachment identifiers without consistently enforcing category-level authorization. It concerns upload and delete operations for FAQ attachments.
The issue may arise in phpMyFAQ deployments where editors are restricted to selected FAQ categories but attachment management requests rely on client-supplied record or attachment identifiers without consistently enforcing category-level authorization. It concerns upload and delete operations for FAQ attachments.
Exploit preconditions
- Attack surface: Authenticated attachment-management endpoints
- Required access: An account with medium permission mode and editor-level access
- Trigger point: An upload or deletion request containing a target
record_idor attachment ID - Why exploitation is possible: The request may identify a resource outside the editor's authorized categories without an effective server-side ownership or category check
- Attack surface: Authenticated attachment-management endpoints
- Required access: An account with medium permission mode and editor-level access
- Trigger point: An upload or deletion request containing a target
record_idor attachment ID - Why exploitation is possible: The request may identify a resource outside the editor's authorized categories without an effective server-side ownership or category check
Why this happens
The underlying flaw is an authorization enforcement gap. The application accepts a client-controlled FAQ record or attachment identifier and does not reliably verify that the authenticated editor is permitted to manage the referenced resource. This behavior maps to CWE-862, Missing Authorization, because access control is absent or inconsistently applied at the operation boundary.
The underlying flaw is an authorization enforcement gap. The application accepts a client-controlled FAQ record or attachment identifier and does not reliably verify that the authenticated editor is permitted to manage the referenced resource. This behavior maps to CWE-862, Missing Authorization, because access control is absent or inconsistently applied at the operation boundary.
Potential impact
- An attacker may upload files to FAQs outside their assigned categories.
- An attacker could delete legitimate attachments from unauthorized FAQs.
- FAQ content integrity and attachment availability may be reduced.
- Malicious or misleading files could be introduced into trusted documentation.
- An attacker may upload files to FAQs outside their assigned categories.
- An attacker could delete legitimate attachments from unauthorized FAQs.
- FAQ content integrity and attachment availability may be reduced.
- Malicious or misleading files could be introduced into trusted documentation.
General mitigation guidance
Mitigation generally focuses on enforcing authorization for every attachment
operation on the server side.
Common defensive patterns include:
- Deriving the target FAQ and category from server-side records rather than trusting identifiers alone.
- Checking the authenticated user's permissions and category scope before upload, replacement, or deletion.
- Applying the same authorization policy consistently across create, update, and delete paths.
- Using deny-by-default behavior when a resource, category, or permission relationship cannot be resolved.
- Limiting editor privileges and separating attachment administration from broader FAQ management where practical.
Mitigation generally focuses on enforcing authorization for every attachment
operation on the server side.
Common defensive patterns include:
- Deriving the target FAQ and category from server-side records rather than trusting identifiers alone.
- Checking the authenticated user's permissions and category scope before upload, replacement, or deletion.
- Applying the same authorization policy consistently across create, update, and delete paths.
- Using deny-by-default behavior when a resource, category, or permission relationship cannot be resolved.
- Limiting editor privileges and separating attachment administration from broader FAQ management where practical.
How teams detect issues like this
Organizations can look for this issue through:
- Static analysis and code review of attachment handlers for missing authorization checks after resource lookup.
- Review signals such as direct use of request-supplied IDs in upload or delete operations.
- Tests that attempt cross-category access with valid authenticated editor accounts.
- Audit logging and alerting for attachment actions involving resources outside the actor's assigned categories.
- Policy enforcement requiring centralized, server-side authorization checks for object-level operations.
Organizations can look for this issue through:
- Static analysis and code review of attachment handlers for missing authorization checks after resource lookup.
- Review signals such as direct use of request-supplied IDs in upload or delete operations.
- Tests that attempt cross-category access with valid authenticated editor accounts.
- Audit logging and alerting for attachment actions involving resources outside the actor's assigned categories.
- Policy enforcement requiring centralized, server-side authorization checks for object-level operations.
