{"id":"CVE-2021-33829","aliases":["BIT-drupal-2021-33829","DEBIAN-CVE-2021-33829","DLA-2813-1","DRUPAL-CORE-2021-003","EUVD-2021-1398","GHSA-rgx6-rjj4-c388","UBUNTU-CVE-2021-33829","USN-5340-1","USN-5340-2"],"status":"published","title":"ckeditor4 vulnerable to cross-site scripting","description":"A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!\u003e is 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cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!\u003e is mishandled.","status":"published","published":"2021-06-09T11:51:00Z","modified":"2024-08-03T23:58:23.102Z","updated_at":"2026-11-02T14:33:10.555814Z"}],"euvd":[{"id":"EUVD-2021-1398","description":"A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!\u003e is mishandled.","status":"published","published":"2021-06-09T11:51:00Z","modified":"2024-08-03T23:58:23Z","updated_at":"2026-11-03T03:24:33.318275Z"}],"ghsa":[{"id":"GHSA-rgx6-rjj4-c388","title":"ckeditor4 vulnerable to cross-site scripting","description":"A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because `--!\u003e` is mishandled.","status":"published","published":"2021-06-21T17:16:42Z","modified":"2024-02-08T09:40:37Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:37:36.777238Z"}],"nvd":[{"id":"CVE-2021-33829","description":"A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!\u003e is mishandled.","status":"published","published":"2021-06-09T12:15:07.863Z","modified":"2026-06-17T03:55:16.897Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/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"],"updated_at":"2026-11-02T14:06:54.439974Z"}],"osv":[{"id":"CVE-2021-33829","description":"A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!\u003e is mishandled.","status":"published","published":"2021-06-09T12:15:07.863Z","modified":"2026-10-24T10:30:47.376403819Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:20.13324Z"},{"id":"DEBIAN-CVE-2021-33829","description":"A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!\u003e is mishandled.","status":"published","published":"2021-06-09T12:15:07.863Z","modified":"2026-10-23T18:03:14.967914719Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:35.233346Z"},{"id":"GHSA-rgx6-rjj4-c388","title":"ckeditor4 vulnerable to cross-site scripting","description":"A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because `--!\u003e` is mishandled.","status":"published","published":"2021-06-21T17:16:42Z","modified":"2025-12-10T23:41:06.10588Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:55.877614Z"},{"id":"UBUNTU-CVE-2021-33829","description":"A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!\u003e is mishandled.","status":"published","published":"2021-06-09T12:15:00Z","modified":"2026-02-04T03:24:39.112112Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:27.870979Z"},{"id":"BIT-drupal-2021-33829","description":"A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!\u003e is mishandled.","status":"published","published":"2024-03-06T10:55:26.487Z","modified":"2026-09-08T08:46:58.872027726Z","updated_at":"2026-11-02T15:28:29.563843Z"},{"id":"DLA-2813-1","title":"ckeditor - security update","status":"published","published":"2021-11-09T00:00:00Z","modified":"2026-03-09T01:18:01.736335Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"id":"DRUPAL-CORE-2021-003","description":"**Update: 2021-06-11: Added CVE-2021-33829 identifier**\n\nDrupal core uses the third-party CKEditor library. This library has an error in parsing HTML that could lead to an XSS attack. CKEditor 4.16.1 and later include the fix.\n\nUpdate: 2021-06-11: More details are available on [CKEditor's blog](https://ckeditor.com/blog/ckeditor-4.16.1-with-accessibility-enhancements/#improvements-for-comments-in-html-parser).\n\nUsers of the CKEditor library via means other than Drupal core should update their 3rd party code (e.g. the WYSIWYG module for Drupal 7). The Drupal Security Team policy is not to alert for issues affecting 3rd party libraries unless those are shipped with Drupal core. See [DRUPAL-SA-PSA-2016-004 for more details](https://www.drupal.org/psa-2016-004).\n\nThis issue is mitigated by the fact that it only affects sites with CKEditor enabled.","status":"published","published":"2021-05-26T18:33:55Z","modified":"2026-09-19T17:44:28Z","updated_at":"2026-11-02T15:46:13.900249Z"},{"id":"USN-5340-1","title":"ckeditor vulnerabilities","description":"Kyaw Min Thein discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue\nto execute arbitrary code. This issue only affects\nUbuntu 18.04 LTS. (CVE-2018-9861)\n\nMicha Bentkowski discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue to\nexecute arbitrary code. This issue only affects\nUbuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-9281)\n\nAnton Subbotin discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue to\nexecute arbitrary code. This issue only affects\nUbuntu 21.10. (CVE-2021-32808)\n\nAnton Subbotin discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue to\ninject arbitrary code. (CVE-2021-32809)\n\nOr Sahar discovered that CKEditor incorrectly handled certain\ninputs. An attacker could possibly use this issue to execute\narbitrary code. This issue only affects\nUbuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-33829)\n\nMika Kulmala discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue to\nexecute arbitrary code. (CVE-2021-37695)\n","status":"published","published":"2022-03-22T16:43:31Z","modified":"2026-04-27T16:19:04.04217959Z","updated_at":"2026-11-02T16:58:15.683829Z"},{"id":"USN-5340-2","title":"ckeditor vulnerabilities","description":"USN-5340-1 fixed several vulnerabilities in CKEditor.\nThis update provides the fixes for CVE-2018-9861, CVE-2020-9281,\nCVE-2021-32809, CVE-2021-33829 and CVE-2021-37695 for Ubuntu 16.04 ESM.\n\nOriginal advisory details:\n\nKyaw Min Thein discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue\nto execute arbitrary code. This issue only affects\nUbuntu 18.04 LTS. (CVE-2018-9861)\n\nMicha Bentkowski discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue to\nexecute arbitrary code. This issue only affects\nUbuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-9281)\n\nAnton Subbotin discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue to\nexecute arbitrary code. This issue only affects\nUbuntu 21.10. (CVE-2021-32808)\n\nAnton Subbotin discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue to\ninject arbitrary code. (CVE-2021-32809)\n\nOr Sahar discovered that CKEditor incorrectly handled certain\ninputs. An attacker could possibly use this issue to execute\narbitrary code. This issue only affects\nUbuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-33829)\n\nMika Kulmala discovered that CKEditor incorrectly handled\ncertain inputs. An attacker could possibly use this issue to\nexecute arbitrary code. (CVE-2021-37695)\n","status":"published","published":"2022-03-23T08:57:25Z","modified":"2026-06-25T13:31:05.424927326Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}