What is CVE-2026-101986?

CVE-2026-101986 is a critical-severity vulnerability in Juniper Networks Junos OS, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-10-14.

How severe is CVE-2026-101986?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Juniper Networks Junos OS

CVE-2026-101986

An Improper Authentication vulnerability in J-Web of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network attacker to bypass J-Web authentication and execute CGI content with elevated privileges via a crafted HTTP request.

Vulnerability class: Broken Authentication

Published 2026-10-14 · last modified 2026-10-14.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Juniper Networks Junos OS
Juniper Networks Junos OS Evolved — versions 23.4X100

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

supportportal.juniper.net/JSA112187 (vendor-advisory)

Frequently asked questions

What is CVE-2026-101986?: CVE-2026-101986 is a critical-severity vulnerability in Juniper Networks Junos OS, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-10-14.
How severe is CVE-2026-101986?: Critical severity. CVSS v3 base score is 9.8 out of 10.