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CVE-2026-101986 is an improper authentication vulnerability in the J-Web management interface of Juniper Networks Junos OS and Junos OS Evolved. An unauthenticated network attacker can send a crafted HTTP request to bypass authentication and execute CGI content with elevated privileges. Exploitation requires J-Web to be enabled and reachable, but does not require credentials or user interaction. The vulnerability is independent of CVE-2026-101956; no exploit chain is required.
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A critical improper authentication vulnerability in J-Web allows an unauthenticated attacker to bypass authentication using a crafted HTTP request and execute CGI content with elevated privileges. It affects Junos OS and Junos OS Evolved across supported branches when J-Web is enabled and reachable, requiring neither credentials nor user interaction. Fixed releases and rebuilt software respins are available, although the content lists no fixed release for Junos OS Evolved 23.4X100. Temporary mitigations are disabling J-Web or restricting access to trusted administrative hosts and networks.
An improper authentication vulnerability in the J-Web interface of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network attacker to bypass authentication and execute CGI content with elevated privileges using a crafted HTTP request. The advisory does not specify affected versions, exploitation activity, or remediation availability.
A critical authentication bypass in the J-Web interface of Juniper Networks Junos OS and Junos OS Evolved enables unauthenticated remote attackers to execute CGI content with elevated privileges using crafted HTTP requests. The reference reports CVSS scores of 9.8 under version 3.1 and 9.3 under version 4.0, but does not identify affected release versions.
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Cross-references every affected SKU, including bundled OEM variants.
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