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

CVSS 4.0

4.8CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2026-09-25

Modified

2026-09-30

Record from

the NVD, synced 2026-10-19

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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