XSS in Strapi
CVE-2026-90561
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (37.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/strapi/strapi/issues/26857 (issue-tracking)
- github.com/strapi/strapi (product)
- github.com/strapi/strapi/blob/v5.46.0/packages/core/content-manager/admin/src/p… (technical-description)
- github.com/strapi/strapi/commit/875752612c30f951546904a29469e51e17e0ac37 (patch)
- www.vulncheck.com/advisories/strapi-4-x-through-4.26.2-and-5-x-before-5.48.1-st… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-90561?
- CVE-2026-90561 is a high-severity vulnerability in Strapi, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-09-13.
- How severe is CVE-2026-90561?
- High severity. CVSS v3 base score is 8.7 out of 10.