{"id":"GHSA-h6mq-3cj6-h738","aliases":[],"status":"published","title":"Reverse Tabnabbing in showdown","description":"Versions of `showdown` prior to 1.9.1 are vulnerable to [Reverse Tabnabbing](https://www.owasp.org/index.php/Reverse_Tabnabbing). The package uses `target='_blank'` in anchor tags, allowing attackers to access `window.opener` for the original page when opening links. This is commonly used for phishing attacks.\n\n\n## Recommendation\n\nUpgrade to version 1.9.1 or later.","severity":{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"low","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1022"],"published":"2020-09-03T23:21:16Z","modified":"2023-04-05T19:39:30Z","fixes":[{"ecosystem":"npm","package":"showdown","fixed_in":["1.9.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"showdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.1"}]}]},{"source":"osv","ecosystem":"npm","package":"showdown","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.9.1"}]}]}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-SHOWDOWN-469487","tags":["web"]},{"url":"https://www.npmjs.com/advisories/1302","tags":["web"]},{"url":"https://github.com/showdownjs/showdown/pull/670","tags":["web"]},{"url":"https://github.com/showdownjs/showdown/commit/1cd281f0643ef613dc1d36847d4c6cbb22501d91","tags":["web"]},{"url":"https://github.com/advisories/GHSA-h6mq-3cj6-h738"},{"url":"https://github.com/showdownjs/showdown","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-h6mq-3cj6-h738","title":"Reverse Tabnabbing in showdown","description":"Versions of `showdown` prior to 1.9.1 are vulnerable to [Reverse Tabnabbing](https://www.owasp.org/index.php/Reverse_Tabnabbing). The package uses `target='_blank'` in anchor tags, allowing attackers to access `window.opener` for the original page when opening links. This is commonly used for phishing attacks.\n\n\n## Recommendation\n\nUpgrade to version 1.9.1 or later.","status":"published","published":"2020-09-03T23:21:16Z","modified":"2023-04-05T19:39:30Z","cvss":[{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-1022"],"updated_at":"2026-11-02T14:36:49.768564Z"}],"osv":[{"id":"GHSA-h6mq-3cj6-h738","title":"Reverse Tabnabbing in showdown","description":"Versions of `showdown` prior to 1.9.1 are vulnerable to [Reverse Tabnabbing](https://www.owasp.org/index.php/Reverse_Tabnabbing). The package uses `target='_blank'` in anchor tags, allowing attackers to access `window.opener` for the original page when opening links. This is commonly used for phishing attacks.\n\n\n## Recommendation\n\nUpgrade to version 1.9.1 or later.","status":"published","published":"2020-09-03T23:21:16Z","modified":"2021-10-01T16:12:36Z","cvss":[{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-1022"],"updated_at":"2026-11-02T15:46:48.546324Z"}]}}