CVE-2026-27867

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

• https://support.teldat.com/images/content/docs/Teldat_dm1087_regesta_smart_nessum_series_installation(1).pdf
• https://support.teldat.com/portal/supportcontent?page=cgs-customer-global-support&none=true&language=en-US
• https://www.hackrtu.com/blog/CNA-CVE-2026-27867/
• https://www.hackrtu.com/blog/CNA-HRTU-0004/
• https://www.teldat.com/es/