{"id":"CVE-2021-29438","aliases":["EUVD-2021-0821","GHSA-g3fq-3v3g-mh32"],"status":"published","title":"Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in @nextcloud/dialogs","description":"The Nextcloud dialogs library (npm package @nextcloud/dialogs) before 3.1.2 insufficiently escaped text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability. The vulnerability has been patched in version 3.1.2 If you need to display HTML in the toast, explicitly pass the `options.isHTML` config flag.","severity":{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00703,"percentile":0.53606,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79","CWE-80"],"published":"2021-04-13T18:40:15Z","modified":"2026-10-20T10:53:45Z","fixes":[{"ecosystem":"npm","package":"@nextcloud/dialogs","fixed_in":["3.1.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@nextcloud/dialogs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@nextcloud/dialogs","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.2"}]}]}],"products":[{"vendor":"nextcloud","product":"nextcloud-dialogs"},{"vendor":"nextcloud\\/dialogs_project","product":"nextcloud\\/dialogs"}],"references":[{"url":"https://github.com/nextcloud/nextcloud-dialogs/security/advisories/GHSA-g3fq-3v3g-mh32","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://www.npmjs.com/package/%40nextcloud/dialogs","tags":["x_refsource_MISC","x_transferred","web"]},{"url":"https://www.npmjs.com/package/@nextcloud/dialogs","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29438","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-g3fq-3v3g-mh32"}],"sources":{"cve":[{"id":"CVE-2021-29438","title":"Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in @nextcloud/dialogs","description":"The Nextcloud dialogs library (npm package @nextcloud/dialogs) before 3.1.2 insufficiently escaped text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability. The vulnerability has been patched in version 3.1.2 If you need to display HTML in the toast, explicitly pass the `options.isHTML` config flag.","status":"published","published":"2021-04-13T18:40:15Z","modified":"2024-08-03T22:02:51.929Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79","CWE-80"],"updated_at":"2026-11-02T14:33:06.658806Z"}],"euvd":[{"id":"EUVD-2021-0821","description":"The Nextcloud dialogs library (npm package @nextcloud/dialogs) before 3.1.2 insufficiently escaped text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability. The vulnerability has been patched in version 3.1.2 If you need to display HTML in the toast, explicitly pass the `options.isHTML` config flag.","status":"published","published":"2021-04-13T18:40:15Z","modified":"2024-08-03T22:02:51Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:24:45.541615Z"}],"ghsa":[{"id":"GHSA-g3fq-3v3g-mh32","title":"Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in @nextcloud/dialogs","description":"### Impact\n\nThe Nextcloud dialogs library before 3.1.2 did insufficiently escape text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability.\n\n_Note_: Nextcloud Server employs a strict Content Security Policy that mitigates the risk of these XSS vulnerabilities.\n\n### Patches\n\nThe vulnerability has been patched in version 3.1.2. If you need to display HTML in the toast, explicitly pass the `options.isHTML` config flag.\n\n### Workarounds\n\nMake sure no user-supplied input flows into toasts.","status":"published","published":"2021-04-16T19:52:58Z","modified":"2023-02-01T05:05:35Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79","CWE-80"],"updated_at":"2026-11-02T14:36:34.917834Z"}],"nvd":[{"id":"CVE-2021-29438","description":"The Nextcloud dialogs library (npm package @nextcloud/dialogs) before 3.1.2 insufficiently escaped text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability. The vulnerability has been patched in version 3.1.2 If you need to display HTML in the toast, explicitly pass the `options.isHTML` config flag.","status":"published","published":"2021-04-13T20:15:22.187Z","modified":"2026-06-17T03:47:38.53Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79","CWE-80"],"updated_at":"2026-11-02T14:06:51.610648Z"}],"osv":[{"id":"CVE-2021-29438","description":"The Nextcloud dialogs library (npm package @nextcloud/dialogs) before 3.1.2 insufficiently escaped text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability. The vulnerability has been patched in version 3.1.2 If you need to display HTML in the toast, explicitly pass the `options.isHTML` config flag.","status":"published","published":"2021-04-13T20:15:22.187Z","modified":"2026-10-20T10:53:45.372036847Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:19.129331Z"},{"id":"GHSA-g3fq-3v3g-mh32","title":"Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in @nextcloud/dialogs","description":"### Impact\n\nThe Nextcloud dialogs library before 3.1.2 did insufficiently escape text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability.\n\n_Note_: Nextcloud Server employs a strict Content Security Policy that mitigates the risk of these XSS vulnerabilities.\n\n### Patches\n\nThe vulnerability has been patched in version 3.1.2. If you need to display HTML in the toast, explicitly pass the `options.isHTML` config flag.\n\n### Workarounds\n\nMake sure no user-supplied input flows into toasts.","status":"published","published":"2021-04-16T19:52:58Z","modified":"2026-07-08T06:28:13.166636808Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79","CWE-80"],"updated_at":"2026-11-02T15:46:47.119724Z"}]}}