CVE-2026-90561 Strapi 4.x through 4.26.2 and 5.x before 5.48.1 Stored XSS via WYSIWYG
Stored XSS in Strapi WYSIWYG allows Authors to execute scripts in Editor or Admin sessions, leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-90561?
CVE-2026-90561 is a critical cross-site scripting vulnerability in strapi, published on 13 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-90561?
How do I fix CVE-2026-90561?
No fix has been published for CVE-2026-90561 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-90561 being exploited?
There is no known exploitation of CVE-2026-90561 in the wild and no public exploit code.
Sources
Also known as GHSA-jh7v-p6jw-jwhc.