CVE-2026-27870 CROSS-SITE SCRIPTING (XSS) VIA MALICIOUS FILE UPLOAD ON REGESTA SMART HD-PLC OF TELDAT
An attacker can inject JavaScript via the Hostname field in the configuration file, leading to Cross-Site Scripting on the Teldat Regesta Smart HD-PLC.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-27870?
CVE-2026-27870 is a medium-severity cross-site scripting vulnerability in Teldat Regesta Smart HD-PLC - TLDPH16D2, published on 17 Jun 2026. An attacker needs administrator access to exploit it, 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 software could, introduce arbitrary JavaScript by injecting a Cross-site Scripting (XSS) payload into the 'Hostname' field of the configuration file resulting in a XSS in the path /upgrade/query.php?cmd=p+3%3Bversion. This issue affects Regesta Smart HD-PLC - TLDPH16D2: 11.02.05.10.02.
Weakness: CWE-79
Which versions are affected by CVE-2026-27870?
How do I fix CVE-2026-27870?
No fix has been published for CVE-2026-27870 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-2026-27870 being exploited?
There is no known exploitation of CVE-2026-27870 in the wild and no public exploit code.
Sources
Also known as GHSA-6mph-64g9-533j.