XSS in Craftcms Cms
CVE-2026-109307
Craft CMS 5.0.0 before 5.10.14 contains a DOM-based cross-site scripting vulnerability in the control panel login and 2FA verification flow, where a user-controlled returnUrl accepting javascript: URLs is used in client-side navigation. Attackers can lure a 2FA-enabled victim into opening a crafted /admin/login?verify=1 URL between password submission and TOTP verification, executing JavaScript in the authenticated control panel with the victim's permissions.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/craftcms/cms/security/advisories/GHSA-w5rh-mhxj-wr8r (vendor-advisory)
- www.vulncheck.com/advisories/craft-cms-5.0.0-before-5.10.14-dom-xss-via-returnu… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109307?
- CVE-2026-109307 is a medium-severity vulnerability in Craftcms Cms, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-10-12.
- How severe is CVE-2026-109307?
- Medium severity. CVSS v3 base score is 4.7 out of 10.