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2014-09-12 Instructure Advisory IAC25534 - Potential data leakage via HTML source in accounts with Profiles enabled

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  Release Date:2014-09-12  (Last update can be found below the document title)
  Description:"View Page Source" may users' information to students in accounts with Profiles enabled
  Criticality Level:Moderately Critical ( Less Critical < Critical < Moderately Critical < Highly Critical )
  • Possible unauthorized access to users' information
  Systems Affected:Canvas LMS
  Solution Status:Patched
  Discovered By:Reported to support by customer at 5:53 PM MT on 9/11/2014
  Relevant Changesets:


A security issue was reported to Instructure Customer Support by a institutional customer who discovered a potential data leakage issue with Canvas. In an account with Profiles enabled, when a student pulls "view source" on another user's course-level user page (.../courses/XXXX/users/XXXX), the resulting HTML may reveal information about the other user, including their login ID, primary email address, and enrollments.


Fixed in Canvas Cloud as of 9/12/2014. Users of Canvas CV are encouraged to either update to the most recent stable code or apply the patch manually.