{"id":"CVE-2021-36539","aliases":["BIT-canvaslms-2021-36539","EUVD-2021-23141","GHSA-pw89-gxgv-mjvm"],"status":"published","title":"Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the...","description":"Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00896,"percentile":0.60042,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200","CWE-639"],"published":"2023-01-26T00:00:00Z","modified":"2026-06-17T03:58:54Z","fixes":[{"ecosystem":"Bitnami","package":"canvaslms","fixed_in":["2022-10-15.0.0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"canvaslms","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2022-10-15.0.0"}]}]}],"products":[{"vendor":"instructure","product":"canvas_learning_management_service"}],"references":[{"url":"https://github.com/instructure/canvas-lms/issues/1905","tags":["x_transferred","Exploit","Third Party Advisory","web"]},{"url":"https://github.com/gaukas/instructure-canvas-file-oracle","tags":["x_transferred","Exploit","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36539"},{"url":"https://github.com/advisories/GHSA-pw89-gxgv-mjvm"}],"sources":{"cve":[{"id":"CVE-2021-36539","description":"Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).","status":"published","published":"2023-01-26T00:00:00Z","modified":"2024-08-04T00:54:51.5Z","updated_at":"2026-11-02T14:33:05.989686Z"}],"euvd":[{"id":"EUVD-2021-23141","description":"Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).","status":"published","published":"2023-01-26T00:00:00Z","modified":"2024-08-04T00:54:51Z","updated_at":"2026-11-03T03:24:29.329171Z"}],"ghsa":[{"id":"GHSA-pw89-gxgv-mjvm","title":"Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the...","description":"Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).","status":"published","published":"2023-01-26T21:30:29Z","modified":"2024-02-02T05:07:37Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-200","CWE-639"],"updated_at":"2026-11-02T14:55:31.84746Z"}],"nvd":[{"id":"CVE-2021-36539","description":"Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).","status":"published","published":"2023-01-26T21:15:23.73Z","modified":"2026-06-17T03:58:54.473Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:07:07.323379Z"}],"osv":[{"id":"BIT-canvaslms-2021-36539","description":"Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).","status":"published","published":"2024-01-31T15:12:08.993Z","modified":"2024-02-19T10:36:29.17Z","updated_at":"2026-11-02T15:28:28.70813Z"}]}}