PT-2026-23086 · Ckeditor · Ckeditor 5

Emilio Kevin + 4 · Published 2026-03-04 · Updated 2026-03-06 · CVE-2026-28343

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions CKEditor 5 versions prior to 47.6.0

Description CKEditor 5, a JavaScript rich-text editor, contains a cross-site scripting (XSS) issue within the General HTML Support feature. This issue arises from the insertion of specially crafted markup, potentially leading to unauthorized JavaScript code execution. The vulnerability is triggered when the editor is configured to use an unsafe General HTML Support configuration. The issue affects installations where General HTML Support is enabled and configured to allow unsafe markup.

Recommendations Versions prior to 47.6.0 should be updated to version 47.6.0 or later. Configure General HTML Support securely to prevent the acceptance of unsafe content.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-28343

GHSA-JRQM-VMQC-GM93

Affected Products

Ckeditor 5

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28343.json · Exploit
• https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-28343 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-28343 · Security Note
• https://osv.dev/vulnerability/CVE-2026-28343 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-28343 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-28343 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-jrqm-vmqc-gm93 · Vendor Advisory
• https://github.com/ckeditor/ckeditor5/releases/tag/v47.6.0 · Note
• https://github.com/ckeditor/ckeditor5 · Note
• https://github.com/ckeditor/ckeditor5/releases/tag/v29.0.0 · Note
• https://twitter.com/cyberbivash/status/2029657049127129425 · Twitter Post
• https://twitter.com/CVEnew/status/2029654695409553554 · Twitter Post
• https://t.me/CVEtracker/46486 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2029725438029758924 · Twitter Post