What is CVE-2026-76858?

CVE-2026-76858 is a medium-severity vulnerability in Netcore Nr255-V, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-09-15.

How severe is CVE-2026-76858?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Netcore Nr255-V

CVE-2026-76858

Netcore NR255-V version 1.5.130703 contains a stored cross-site scripting vulnerability in ddns_wan_list_show.cgi caused by unsafe eval() handling of DDNS data. Attackers can inject malicious script through the DDNS configuration path, leading to persistent execution when the affected page is viewed.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-09-15 · last modified 2026-09-16.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (22.4th percentile), scored 2026-11-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Netcore Nr255-V — versions 1.5.130703

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr2… (third-party-advisory)
www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-stored-cross-site-scrip… (third-party-advisory)

Frequently asked questions

What is CVE-2026-76858?: CVE-2026-76858 is a medium-severity vulnerability in Netcore Nr255-V, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-09-15.
How severe is CVE-2026-76858?: Medium severity. CVSS v3 base score is 4.8 out of 10.