Auth bypass in Netcore Nr255-V
CVE-2026-76863
Netcore NR255-V version 1.5.130703 contains a sensitive information disclosure vulnerability in the mod_qos_bandwidth plan.json handling within filter_conns_dump_cgi.c and IGD_CgiCall.c. Authenticated users with broad roles can access these QoS read routes to obtain live network telemetry beyond their intended privilege level.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.6% 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)
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-sensitive-information-d… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-76863?
- CVE-2026-76863 is a medium-severity vulnerability in Netcore Nr255-V, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-09-15.
- How severe is CVE-2026-76863?
- Medium severity. CVSS v3 base score is 4.3 out of 10.