CVE-2026-109307 Craft CMS 5.0.0 before 5.10.14 DOM XSS via returnUrl in 2FA Verification
Attackers can execute JavaScript in the authenticated control panel via DOM XSS in the 2FA verification flow, potentially taking over accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-109307?
CVE-2026-109307 is a low-severity cross-site scripting vulnerability in craftcms cms, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-109307?
How do I fix CVE-2026-109307?
No fix has been published for CVE-2026-109307 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-2026-109307 being exploited?
There is no known exploitation of CVE-2026-109307 in the wild and no public exploit code.
Sources
Also known as GHSA-c72m-w87q-gvqm, GHSA-w5rh-mhxj-wr8r.