CVE-2026-27867
CROSS-SITE SCRIPTING (XSS) VIA THE CMDCOOKIE PARAMETER REGESTA SMART HD-PLC OF TELDAT
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
INFO
Published Date :
Sept. 25, 2026, 11:17 a.m.
Last Modified :
Sept. 30, 2026, 5:32 p.m.
Remotely Exploit :
Yes !
Source :
ffb98d57-deaa-4918-a669-5225ccc13e39
Affected Products
The following products are affected by CVE-2026-27867
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | MEDIUM | ffb98d57-deaa-4918-a669-5225ccc13e39 | ||||
| CVSS 4.0 | MEDIUM | ffb98d57-deaa-4918-a669-5225ccc13e39 |
Solution
- Update the Regesta Smart HD-PLC firmware.
- Ensure the firmware version is 11.02.06.00.02 or later.
- Avoid using the affected upgrade/index.html endpoint.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27867.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27867 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27867
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27867 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-27867 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by ffb98d57-deaa-4918-a669-5225ccc13e39
Sep. 25, 2026
Action Type Old Value New Value Added 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 Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-79 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/27xxx/CVE-2026-27867.json">CVE-2026-27867</a> Added Reference https://support.teldat.com/images/content/docs/Teldat_dm1087_regesta_smart_nessum_series_installation(1).pdf Added Reference https://support.teldat.com/portal/supportcontent?page=cgs-customer-global-support&none=true&language=en-US Added Reference https://www.hackrtu.com/blog/CNA-CVE-2026-27867/ Added Reference https://www.hackrtu.com/blog/CNA-HRTU-0004/ Added Reference https://www.teldat.com/es/ -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 25, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-27867', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-25T10:42:56.136783Z'}