Vulnerability
CVE-2026-86426
LibreNMS: authentication bypass leading to code execution
Most severe levelDEFCON 4 · Moderate risk
Official data
- CVSS 4.0
- 9.2 · critical
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-287
- EPSS
- 4.36% probability of exploitation in the next 30 days, higher than 91% of CVEs
- CISA KEV catalogue
- No
Sources: NVD (CVSS, weakness, publication), FIRST (EPSS), CISA (KEV catalogue).
Data read on 5 November 2026.
Timeline
- 7 September 2026Published on NVD
- 8 September 2026First in the DefenceLevel briefing
In DefenceLevel briefings2 days
- 29 October 2026Other exploited vulnerabilitiesDEFCON 4
- 8 September 2026New in the last 24 hoursDEFCON 4
Last 12 months.
The full analysis is in the briefingThe full analysis is in your archive
Why it matters now, who is affected and what to do: every day at 05:00 UTC, for subscribers.Why it matters, who is affected and what to do, as in the daily briefing.