CVE-2026-27694 traccar allows stored HTML injection in notification emails

Medium 5.4 Published 5 May 2026 Updated 5 May 2026

Attackers can inject HTML into notification emails via device names, enabling phishing or spoofing against other users.

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-2026-27694?

CVE-2026-27694 is a medium-severity cross-site scripting vulnerability in traccar, published on 5 May 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

Traccar is an open source GPS tracking system. In org.traccar:traccar versions starting at 6.11.1 before 6.13.0, the email notification templates insert user-controlled device, geofence, and driver names into HTML email output without proper escaping. An attacker with low privileges can store crafted HTML in these fields, which is then rendered in notification emails sent to other users with access to the affected devices. This can lead to phishing or spoofed email content. This issue is fixed in version 6.13.0.

Weakness: CWE-79

Which versions are affected by CVE-2026-27694?

It affects 1 product.

Products include Traccar Traccar.

How do I fix CVE-2026-27694?

No fix has been published for CVE-2026-27694 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-2026-27694 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27694 exists.

Sources

Also known as GHSA-6hfr-mj4m-hrvv.