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Security: Restrict REST course self-enrolment - refs GHSA-qc88-h6gp-4gcg - #9237
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REST v2 self-subscription accepted the requested course status while calling CourseManager::subscribeUser() with checkTeacherPermission=false.
That flag was intentionally introduced for administrative webservice operations, so platform administrators keep the existing behavior. Normal REST users may still subscribe themselves, but the server now forces STUDENT and uses the regular course self-subscription flow, which applies the course registration rules.
Verified against a running 1.11.x instance:
The historical checkTeacherPermission=false behavior is therefore preserved for administrative webservice use only.
Refs GHSA-qc88-h6gp-4gcg