CVE-2026-101986 Junos OS and Junos OS Evolved: J-Web permits pre-authentication CGI execution
Unauthenticated attackers can bypass J-Web authentication to execute CGI content with elevated privileges on Juniper Junos OS devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101986?
CVE-2026-101986 is a critical authentication bypass vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-101986?
How do I fix CVE-2026-101986?
No fix has been published for CVE-2026-101986 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-101986 being exploited?
There is no known exploitation of CVE-2026-101986 in the wild and no public exploit code.
Sources
Also known as GHSA-9pc2-64g4-44mw.