CVE-2026-27870
CVE-2026-27870 is a medium-severity vulnerability with a CVSS 4.0 base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 4.0 base score 4.8)
- EPSS exploit prediction: 0% (21st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-37577
- Weakness: CWE-79
- Published:
- Last modified:
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 software could, introduce arbitrary JavaScript by injecting a Cross-site Scripting (XSS) payload into the 'Hostname' field of the configuration file resulting in a XSS in the path /upgrade/query.php?cmd=p+3%3Bversion. This issue affects Regesta Smart HD-PLC - TLDPH16D2: 11.02.05.10.02.
Frequently asked questions
- What is CVE-2026-27870?
- 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 software could, introduce arbitrary JavaScript by injecting a Cross-site Scripting (XSS) payload into the 'Hostname' field of the configuration file resulting in a XSS in the path /upgrade/query.php?cmd=p+3%3Bversion. This issue affects Regesta Smart HD-PLC - TLDPH16D2: 11.02.05.10.02.
- How severe is CVE-2026-27870?
- CVE-2026-27870 has a CVSS 4.0 base score of 4.8, rated medium severity.
- Is CVE-2026-27870 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-27870?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-27870 have an EU (EUVD) identifier?
- Yes. CVE-2026-27870 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37577.
- When was CVE-2026-27870 published?
- CVE-2026-27870 was published on 2026-06-17 and last updated on 2026-07-01.
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-2026-27870/
- https://www.hackrtu.com/blog/CNA-HRTU-0003/
- https://www.teldat.com/es/
EU advisories (EUVD)
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