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TI-2026-81520 Aliases CVE-2026-116687GHSA-v6mg-96c6-gmpq

Cross-site scripting in CKEditor 5 engine package

Priority LOW 15CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

CKEditor 5, a JavaScript rich-text editor, is affected from 29.0.0 before 47.7.4 and from 48.0.0 before 48.5.1. Specially crafted markup can trigger cross-site scripting (CWE-79) when General HTML Support is enabled and configured to allow object content. Processing that content can run attacker-controlled JavaScript in a browser context isolated from the origin of the embedding application.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. From 29.0.0 until 47.7.4 and 48.5.1, specially crafted markup can trigger cross-site scripting when General HTML Support is enabled and specifically configured to allow object content. Processing that content can execute attacker-controlled JavaScript in a browser context isolated from the origin of the application embedding the editor. This issue is fixed in versions 47.7.4 and 48.5.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00252 16th percentileScored 2026-11-07
Fix Fixed ckeditor5 (ckeditor): 47.7.4, 48.5.1ckeditor5 (npm): 47.7.4, 48.5.1+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ckeditorckeditor529.0.0 to before 47.7.4; 48.0.0 to before 48.5.147.7.4, 48.5.1Patch availableCNA
—ckeditor5 (npm)29.0.0 to before 47.7.447.7.4Patch availableGHSA-v6mg-96c6-gmpq
—@ckeditor/ckeditor5-engine (npm)29.0.0 to before 47.7.447.7.4Patch availableGHSA-v6mg-96c6-gmpq
—ckeditor5 (npm)48.0.0 to before 48.5.148.5.1Patch availableGHSA-v6mg-96c6-gmpq
—@ckeditor/ckeditor5-engine (npm)48.0.0 to before 48.5.148.5.1Patch availableGHSA-v6mg-96c6-gmpq
  • ckeditor5 Vendorckeditor Affected 29.0.0 to before 47.7.4; 48.0.0 to before 48.5.1 Fixed in 47.7.4, 48.5.1 Patch available CNA
  • ckeditor5 (npm) Vendor— Affected 29.0.0 to before 47.7.4 Fixed in 47.7.4 Patch available GHSA-v6mg-96c6-gmpq
  • @ckeditor/ckeditor5-engine (npm) Vendor— Affected 29.0.0 to before 47.7.4 Fixed in 47.7.4 Patch available GHSA-v6mg-96c6-gmpq
  • ckeditor5 (npm) Vendor— Affected 48.0.0 to before 48.5.1 Fixed in 48.5.1 Patch available GHSA-v6mg-96c6-gmpq
  • @ckeditor/ckeditor5-engine (npm) Vendor— Affected 48.0.0 to before 48.5.1 Fixed in 48.5.1 Patch available GHSA-v6mg-96c6-gmpq

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:ckeditor:ckeditor5:*:*:*:*:*:*:*:*——ckeditor
  • cpe:2.3:a:ckeditor:ckeditor5:*:*:*:*:*:*:*:* Versions — — ·ckeditor

Remediation

Upgrade ckeditor5 and @ckeditor/ckeditor5-engine to 47.7.4 for the 47 line and to 48.5.1 for the 48 line.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

  • Fix · CNA ckeditor5 (ckeditor) Fixed in 47.7.4, 48.5.1
  • Fix · GHSA-v6mg-96c6-gmpq ckeditor5 (npm) Fixed in 47.7.4 Advisory →
  • Fix · GHSA-v6mg-96c6-gmpq @ckeditor/ckeditor5-engine (npm) Fixed in 47.7.4 Advisory →
  • Fix · GHSA-v6mg-96c6-gmpq ckeditor5 (npm) Fixed in 48.5.1 Advisory →
  • Fix · GHSA-v6mg-96c6-gmpq @ckeditor/ckeditor5-engine (npm) Fixed in 48.5.1 Advisory →

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-116687
  2. 2026-10-27 Alias added: GHSA-v6mg-96c6-gmpq
  3. 2026-11-03 CISA SSVC decision points changed

References

Other 6

  • TI-2023-15111 A unrestricted file upload vulnerability was discovered in the ‘Browse and upload images’… CVSS 3.1CRITICAL 9.8
  • TI-2025-37971 A reflected cross-site scripting (XSS) vulnerability in CKeditor v46.1.0 & Angular… CVSS 3.1MEDIUM 5.4
  • TI-2021-18004 HTML comments vulnerability allowing to execute JavaScript code CVSS 3.1HIGH 8.2
  • TI-2026-81521 Cross-site scripting in CKEditor 5 engine package CVSS 3.1HIGH 8.1
  • TI-2022-08543 Regular expression Denial of Service in dialog plugin CVSS 3.1HIGH 7.5
  • TI-2021-18003 Advanced Content Filter (ACF) vulnerability allowing to execute JavaScript code using malformed HTML CVSS 3.1HIGH 8.2
See all 38 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences