CVE-2026-116688
highCKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture.
CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. From 45.0.0 until 47.7.4 and 48.5.1, the engine uses a vulnerable es-toolkit version whose prototype-pollution behavior can be reached while CKEditor processes incoming style attribute values. Crafted editor content can thereby cause unauthorized JavaScript execution in the browser. This issue is fixed in versions 47.7.4 and 48.5.1.
CVSS
8.1
8.1 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Severity source: NVD CVSS v3.1 (security-advisories@github.com)
Timeline (UTC)
Published: 2026-10-27 20:17
Modified: 2026-10-28 15:21
NVD status: Awaiting Analysis
Last synced 1 day ago
Verified against the source API 2026-10-28 15:27 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280c86a0 security-advisories@github.com
- https://github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd702850423 security-advisories@github.com
- https://github.com/ckeditor/ckeditor5/releases/tag/v47.7.4 security-advisories@github.com
- https://github.com/ckeditor/ckeditor5/releases/tag/v48.5.1 security-advisories@github.com
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-rh54-vffm-5fvp security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-28 15:27 UTC · record ↗