CVE-2026-76852

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Netcore NR268 firmware version 1.7.121109 has an improper integrity verification flaw in mtd_write allowing forged firmware authenticity checks. Attackers can exploit put_file.cgi and check_image_uuid.c to bypass firmware signature validation and load unauthorized firmware images.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 17, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Netcore NR268 1.7.121109 Forgeable Firmware Authenticity Check in mtd_write | Advisories | VulnCheck

https://www.vulncheck.com/advisories/netcore-nr268-1.7.121109-forgeable-firmware-authenticity-check-in-mtd-write
generic🟡 PoC Available

netcore-router-public-refs/2026.08.19-netcore-nr268-firmware-forgery.md at main · draw-ctf/netcore-router-public-refs · GitHub

https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr268-firmware-forgery.md

Vendor Advisories for CVE-2026-76852(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 17× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 04:22 UTCEG score recompute
  2. 2026-09-19 04:22 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 16:55 UTCGHSA enrichment
  5. 2026-09-18 05:28 UTCEG score recompute
  6. 2026-09-18 05:28 UTCGHSA enrichment
  7. 2026-09-17 18:01 UTCEG score recompute
  8. 2026-09-17 18:01 UTCGHSA enrichment
  9. 2026-09-17 07:21 UTCGHSA enrichment
  10. 2026-09-16 19:53 UTCEG score recompute
  11. 2026-09-16 19:53 UTCGHSA enrichment
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 09:47 UTCEG score recompute
  14. 2026-09-16 09:47 UTCGHSA enrichment
  15. 2026-09-15 22:19 UTCEG score recompute
  16. 2026-09-15 22:04 UTCEG score recompute
  17. 2026-09-15 22:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-76852?
CVE-2026-76852 is a high vulnerability published on September 15, 2026. Netcore NR268 firmware version 1.7.121109 has an improper integrity verification flaw in mtdwrite allowing forged firmware authenticity checks. Attackers can exploit putfile.cgi and checkimageuuid.c to bypass firmware signature validation and load unauthorized firmware images.
When was CVE-2026-76852 disclosed?
CVE-2026-76852 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76852 actively exploited?
CVE-2026-76852 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 85.8% of all scored CVEs.
What is the CVSS score of CVE-2026-76852?
CVE-2026-76852 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-76852?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76852, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-76852

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