---
id: CVE-2026-27867
title: "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\na specific payload\_via the parameter \"cmdcookie\" …"
summary: "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\na specific payload\_via the parameter \"cmdcookie\" …"
severity: medium
cvss: 4.8
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-79
vendor: Teldat
product: Regesta Smart HD-PLC - TLDPH16D2
affected:
  - regesta_smart_hd-plc_-_tldph16d2 11.02.06.00.02
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:01.203'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-27867'
references:
  - url: >-
      https://support.teldat.com/images/content/docs/Teldat_dm1087_regesta_smart_nessum_series_installation(1).pdf
    label: ffb98d57-deaa-4918-a669-5225ccc13e39
  - url: >-
      https://support.teldat.com/portal/supportcontent?page=cgs-customer-global-support&none=true&language=en-US
    label: ffb98d57-deaa-4918-a669-5225ccc13e39
  - url: 'https://www.hackrtu.com/blog/CNA-CVE-2026-27867/'
    label: ffb98d57-deaa-4918-a669-5225ccc13e39
  - url: 'https://www.hackrtu.com/blog/CNA-HRTU-0004/'
    label: ffb98d57-deaa-4918-a669-5225ccc13e39
  - url: 'https://www.teldat.com/es/'
    label: ffb98d57-deaa-4918-a669-5225ccc13e39
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-25T10:42:56.136783Z'
cvssSource: cna
ingestedAt: '2026-09-25T11:06:38.802Z'
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.