Teldat Regesta Smart HD-PLC up to 11.02.05.10.02 Configuration File /upgrade/query.php Hostname cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Teldat Regesta Smart HD-PLC up to 11.02.05.10.02. This vulnerability affects unknown code of the file /upgrade/query.php of the component Configuration File Handler. This manipulation of the argument Hostname causes cross site scripting. The identification of this vulnerability is CVE-2026-27870. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Teldat Regesta Smart HD-PLC up to 11.02.05.10.02. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file /upgrade/query.php of the component Configuration File Handler. The manipulation of the argument Hostname with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

The weakness was shared by Aarón Flecha Menéndez and Víctor Bello Cuevas. The advisory is shared at hackrtu.com. This vulnerability is known as CVE-2026-27870 since 02/24/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

By approaching the search of inurl:upgrade/query.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 11.02.06.00.02 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Teldat

Name

• Regesta Smart HD-PLC

Version

• 11.02.05.10.02

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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