CVE-2026-90561
Strapi versions 4.x through 4.26.2 and 5.x before 5.48.1 have a stored cross‑site scripting flaw in the content manager’s WYSIWYG preview component. The component fails to strip script tags from rich‑text fields, allowing an Author‑role user to embed malicious scripts that run when the preview pane is expanded. This can lead to account takeover by privileged users such as Editors or Super Admins.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
Strapi 4.x (up to 4.26.2) and 5.x (up to 5.48.1). Users with Author role who can store rich‑text content, and Editors or Super Admins who view the preview pane.
Real-world impact
An attacker can inject JavaScript that executes in the session of an Editor or Super Admin when they expand the preview pane, enabling the attacker to hijack the account, steal credentials, or perform other privileged actions.
Why this severity
The CVSS score of 9.3 reflects a critical vulnerability: it has high confidentiality, integrity, and availability impact, requires low attack complexity, and needs only user interaction (preview pane expansion). The attacker must have Author‑role privileges to inject the script, but the impact is severe because it can compromise privileged accounts.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources