{"id":"CVE-2021-3734","aliases":["EUVD-2021-1859","GHSA-r6g8-jmj9-g945"],"status":"published","title":"Improper Restriction of Rendered UI Layers or Frames in yourls/yourls","description":"yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames","severity":{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00405,"percentile":0.35126,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1021","CWE-352"],"published":"2021-08-26T12:48:50Z","modified":"2026-10-20T10:54:49Z","affected":[{"source":"ghsa","ecosystem":"Packagist","package":"yourls/yourls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.8.1"}]}]},{"source":"osv","ecosystem":"Packagist","package":"yourls/yourls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.8.1"}]}],"versions":["1.7.1","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.7.9","1.8","1.8.1"]}],"products":[{"vendor":"yourls","product":"yourls"},{"vendor":"yourls","product":"yourls/yourls"}],"references":[{"url":"https://huntr.dev/bounties/dd2e2dbe-efe5-49ec-be11-7a7e7c41debd","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://github.com/yourls/yourls/commit/0a70acdcfb5fcbc63dbc5750018d608288eba3fe","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3734","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-r6g8-jmj9-g945"},{"url":"https://github.com/yourls/yourls","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-3734","title":"Improper Restriction of Rendered UI Layers or Frames in yourls/yourls","description":"yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames","status":"published","published":"2021-08-26T12:48:50Z","modified":"2024-08-03T17:01:08.346Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-1021"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-1859","description":"yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames","status":"published","published":"2021-08-26T12:48:50Z","modified":"2024-08-03T17:01:08Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:25:11.953192Z"}],"ghsa":[{"id":"GHSA-r6g8-jmj9-g945","title":"Improper Restriction of Rendered UI Layers or Frames in yourls","description":"yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames","status":"published","published":"2021-08-30T16:22:16Z","modified":"2023-02-01T05:06:24Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-352","CWE-1021"],"updated_at":"2026-11-02T14:36:38.281533Z"}],"nvd":[{"id":"CVE-2021-3734","description":"yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames","status":"published","published":"2021-08-26T13:15:08.677Z","modified":"2026-06-17T04:05:39.687Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-1021","CWE-352"],"updated_at":"2026-11-02T14:06:57.67549Z"}],"osv":[{"id":"CVE-2021-3734","description":"yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames","status":"published","published":"2021-08-26T13:15:08.677Z","modified":"2026-10-20T10:54:49.337685386Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:20.434873Z"},{"id":"GHSA-r6g8-jmj9-g945","title":"Improper Restriction of Rendered UI Layers or Frames in yourls","description":"yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames","status":"published","published":"2021-08-30T16:22:16Z","modified":"2023-11-08T04:06:18.147633Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-1021","CWE-352"],"updated_at":"2026-11-02T15:46:55.480549Z"}]}}
