CVE-2026-103904 Stored XSS Vulnerability in JTL-Shop
Unauthenticated attackers can inject scripts via consent names, leading to code execution in admin sessions and potential privilege escalation.
- 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-2026-103904?
CVE-2026-103904 is a high-severity cross-site scripting vulnerability in JTL-Software GmbH JTL-Shop, published on 14 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
The public consent endpoint of JTL-Shop accepts arbitrary consent names from unauthenticated visitors without validating them against the configured consent items. These names are stored in the consent statistics and rendered without output encoding in the administration backend. An unauthenticated remote attacker can thereby inject script code that is executed in the browser session of an administrator viewing the consent statistics page, allowing actions to be performed with the administrator's privileges.
Weakness: CWE-79
Which versions are affected by CVE-2026-103904?
How do I fix CVE-2026-103904?
No fix has been published for CVE-2026-103904 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-2026-103904 being exploited?
There is no known exploitation of CVE-2026-103904 in the wild and no public exploit code.
Sources
Also known as GHSA-xqfj-gwfj-j97g.