Vulnerability record · CVE-2026-28343 · published 5 March 2026

CVE-2026-28343: Ckeditor5 cross-site scripting vulnerability

Ckeditor · Ckeditor5

CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. Starting in version 29.0.0 and prior to version 47.6.0, a cross-site scripting (XSS) vulnerability has been discovered in the General HTML Support feature. This vulnerability could be triggered by inserting specially crafted markup, leading to unauthorized JavaScript code execution, if the editor instance used an unsafe General HTML Support configuration. This issue has been patched in version 47.6.0.

6.1 CVSS 3.1 Medium EPSS 0.35% · top 74.1% CWE-79 · Cross-site scripting

6.1CVSS 3.1 base score

0.35%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Ckeditor5 Ckeditor

References

Link	Tags
https://github.com/ckeditor/ckeditor5/releases/tag/v29.0.0
https://github.com/ckeditor/ckeditor5/releases/tag/v47.6.0	Release Notes
https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93	MitigationVendor Advisory

Track CVE-2026-28343 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.5CVE-2021-21254Ckeditor5 uncontrolled resource consumption vulnerabilityCKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm…EPSS 1.8%29 Jan 2021 5.4CVE-2025-61261Angular cross-site scripting vulnerabilityA reflected cross-site scripting (XSS) vulnerability in CKeditor v46.1.0 & Angular v18.0.0 allows attackers to execute arbitrary code in the context …EPSS 0.27%7 Nov 2025 5.1CVE-2024-45613Ckeditor5 cross-site scripting vulnerabilityCKEditor 5 is a JavaScript rich-text editor. Starting in version 40.0.0 and prior to version 43.1.1, a Cross-Site Scripting (XSS) vulnerability is pr…EPSS 0.52%25 Sep 2024 6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed14 May 2026 6.1CVE-2025-48700Zimbra Classic UI stored XSS via crafted email HTMLZimbra Collaboration Suite Classic UI fails to properly sanitize HTML content in email messages, allowing crafted tag structures and attribute values…KEVEPSS 1.7%analysed23 Jun 2025 6.1CVE-2025-66376Zimbra Collaboration Classic UI stored XSS via CSS @import in emailZimbra Collaboration Suite 10 before 10.0.18 and 10.1 before 10.1.13 allows stored cross-site scripting in the Classic UI through CSS @import directi…KEVEPSS 20%analysed5 Jan 2026 6.1CVE-2025-68461Roundcube Webmail XSS via SVG animate tagRoundcube Webmail before 1.5.12 and 1.6 before 1.6.12 is vulnerable to cross-site scripting through the animate tag in an SVG document. Because the f…KEVEPSS 27%analysed18 Dec 2025 10.0CVE-2026-22769Dell RecoverPoint for Virtual Machines hardcoded credential flawDell RecoverPoint for Virtual Machines versions prior to 6.0.3.1 HF1 contain a hardcoded credential vulnerability (CWE-798). An unauthenticated remot…KEVEPSS 13%analysed17 Feb 2026

Source: NIST National Vulnerability Database (record CVE-2026-28343), CISA KEV, FIRST EPSS (scores of 2026-09-30). This page is refreshed as NVD updates the record.