CVE-2021-21391mediumCWE-400

CVE-2021-21391: falha de média gravidade em ckeditor5

Regular expression Denial of Service in multiple packages

Publicada em · Atualizada em

Seguir esta CVE+ Monitorar ckeditor5+ Monitorar @ckeditor/ckeditor5-engine

Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.

13Vexday Risk Score

Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.

ssvc Trackcvss 6.5epss 1.7%
CKEditor 5 provides a WYSIWYG editing solution. This CVE affects the following npm packages: ckeditor5-engine, ckeditor5-font, ckeditor5-image, ckeditor5-list, ckeditor5-markdown-gfm, ckeditor5-media-embed, ckeditor5-paste-from-office, and ckeditor5-widget. Following an internal audit, a regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0. The problem has been recognized and patched. The fix will be available in version 27.0.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Produtos afetados
ckeditor · ckeditor5
CVEs relacionadas — ckeditor5

No mesmo produto, das mais perigosas para as menos.

CVE-2021-21254MEDIUMRegular expression Denial of Service in Markdown pluginEPSS 1.8%CVE-2022-31175MEDIUMCross-site scripting caused by the editor instance destroying process in ckeditor5EPSS 0.9%CVE-2025-25299LOWCross-site scripting (XSS) in the real-time collaboration packageEPSS 0.6%CVE-2024-45613MEDIUMCKEditor 5 has Cross-site Scripting vulnerability in the clipboard packageEPSS 0.5%CVE-2026-116688HIGHCKEditor: Cross-site scripting (XSS) in the engine packageEPSS 0.5%CVE-2025-58064LOWCKEditor is susceptible to Cross-Site Scripting (XSS) through its clipboard packageEPSS 0.4%