# CVE-2026-90561

## Summary

- **CVE ID:** CVE-2026-90561
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N)
- **CWE:** CWE-79
- **Published:** Sep 13, 2026
- **Last Modified:** Sep 13, 2026

## Description

Strapi versions 4.x through 4.26.2 and 5.x before 5.48.1 contain a stored cross-site scripting vulnerability in the content manager WYSIWYG preview component that fails to strip script tags from rich text. An Author-role user can store malicious script tags in rich text fields that execute in an Editor or Super Admin's session when the preview pane is expanded, enabling account takeover.

## Affected Products

- strapi — strapi (4.0.0)
- strapi — strapi (5.0.0)

## References

- [CNA](https://github.com/strapi/strapi/issues/26857)
- [CNA](https://github.com/strapi/strapi)
- [CNA](https://github.com/strapi/strapi/blob/v5.46.0/packages/core/content-manager/admin/src/pages/EditView/components/FormInputs/Wysiwyg/PreviewWysiwyg.tsx)
- [CNA](https://github.com/strapi/strapi/commit/875752612c30f951546904a29469e51e17e0ac37)
- [CNA](https://www.vulncheck.com/advisories/strapi-4-x-through-4.26.2-and-5-x-before-5.48.1-stored-xss-via-wysiwyg)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 14.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._