Vulnerability advisory

CVE-2021-26272

Published Jan 26, 2021Updated Oct 24, 2026OSV record ↗

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected versions

Repository

Affected commits	Fixed by commit
GIT github.com/ckeditor/ckeditor4 ↗
769d96134bcf29f5d3d870e25797ce9b9dc8289e to before 17a1555f7fbb0e83f737c9efe27650dca8dff36f	`17a1555f7fbb0e83f737c9efe27650dca8dff36f`
Also listed as affected (23) `4.15.0` `4.14.0` `4.13.0` `4.12.0` `4.10.0` `4.8.0` `4.7.0` `4.6.0` `4.5.0` `4.5.0-beta` `4.4.1` `4.4.0` `4.2.3` `4.2.2` `4.2.1` `4.2.0` `4.2` `4.1.0` `4.1` `4.1rc` `4.0.1` `4.0.0` `4.0`
GIT github.com/ckeditor/ckeditor4-releases ↗
870a561110a23435d78eda377400dca7f64d3bd3 to before a393696ad5523e9f5ffab76e9b653240c49c770b	`a393696ad5523e9f5ffab76e9b653240c49c770b`
Also listed as affected (64) `standard/4.15.1` `standard/4.15.0` `standard/4.14.1` `standard/4.14.0` `standard/4.13.1` `standard/4.13.0` `standard/4.12.1` `standard/4.12.0` `standard/4.11.4` `standard/4.11.3` `standard/4.11.2` `standard/4.11.1` `standard/4.11.0` `standard/4.10.1` `standard/4.10.0` `standard/4.9.2` `standard/4.9.1` `standard/4.9.0` `standard/4.8.0` `standard/4.7.3` `standard/4.7.2` `standard/4.7.1` `standard/4.7.0` `standard/4.6.2` `standard/4.6.1` `standard/4.6.0` `standard/4.5.11` `standard/4.5.10` `standard/4.5.9` `standard/4.5.8` `standard/4.5.7` `standard/4.5.6` `standard/4.5.5` `standard/4.5.4` `standard/4.5.3` `standard/4.5.2` `standard/4.5.1` `standard/4.5.0` `standard/4.4.8` `standard/4.4.7` `standard/4.4.6` `standard/4.4.5` `standard/4.4.4` `standard/4.4.3` `standard/4.4.2` `standard/4.4.1` `standard/4.4.0` `standard/4.3.5` `standard/4.3.4` `standard/4.3.3` `4.3.2/standard` `4.3.1/standard` `4.3.0/standard` `4.2.3/standard` `4.2.2/standard` `4.2.1/standard` `4.2/standard` `4.1.3/standard` `4.1.2/standard` `4.1.1/standard` `4.1/standard` `4.1rc/standard` `4.0.1/standard` `4.0/standard`

Description

It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted URL-like text into the editor, and then press Enter or Space (in the Autolink plugin).

CVE-2021-26272

Affected versions

Repository

Description

References