CVE-2026-27867 CROSS-SITE SCRIPTING (XSS) VIA THE CMDCOOKIE PARAMETER REGESTA SMART HD-PLC OF TELDAT
An attacker can inject malicious scripts via the cmdcookie parameter in the upgrade interface, potentially executing code or bypassing security controls.
- 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-2026-27867?
CVE-2026-27867 is a medium-severity cross-site scripting vulnerability in Teldat Regesta Smart HD-PLC - TLDPH16D2, published on 25 Sep 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
An attacker with access via network to the Regesta Smart HD-PLC of the provider Teldat (in this case, registration action is required) who has the vulnerable firmware version could inject a specific payload via the parameter "cmdcookie" withing the /upgrade/index.html resulting in to a Cross-Site Scripting (XSS). This issue affects Regesta Smart HD-PLC - TLDPH16D2: 11.02.06.00.02
Weakness: CWE-79
Which versions are affected by CVE-2026-27867?
How do I fix CVE-2026-27867?
No fix has been published for CVE-2026-27867 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-2026-27867 being exploited?
There is no known exploitation of CVE-2026-27867 in the wild and no public exploit code.
Sources
Also known as GHSA-jj76-67xg-c9gj.