CVE-2026-27867: CROSS-SITE SCRIPTING (XSS) VIA THE CMDCOOKIE PARAMETER REGESTA SMART HD-PLC OF TELDAT

Severity: medium (CVSS 4.8 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-25 · updated 2026-09-30
Weakness: CWE-79

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

Affected products

Teldat Regesta Smart HD-PLC - TLDPH16D2: 11.02.06.00.02

References

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/

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