CVE-2026-101986 Juniper Networks Junos OS - Authentication Bypass

Juniper Networks Junos OS and Junos OS Evolved contain an improper authentication vulnerability in J-Web, caused by insufficient authentication checks, letting unauthenticated network attackers bypass authentication and execute CGI content with elevated privileges via crafted HTTP requests.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-287

Vendor fix

Update to the latest Junos OS and Junos OS Evolved versions with the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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