CVE Feed

    Dashboard / CVE / CVE-2026-66842

    CVE-2026-66842

    BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts through an undisclosed request to Traffic Management User Interface (TMUI). Impact: This vulnerability may allow an authenticated attacker with network access to the BIG-IP management interface to escalate privileges by creating administrative accounts on the BIG-IP system. There is no data plane exposure; this is a control plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

    Published:Sep 2, 2026
    Last Modified:Sep 3, 2026
    EPS:Sep 2, 2026
    EPSS Score:0.00249
    CVSS Score:8.8

    Affected Products

    Vendor
    F5
    Product
    Big-ip
    Vendor
    F5
    Product
    Big-iq

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Related CVEs

    CVE-2026-63020 (CVSS 2.3) — A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof…
    CVE-2026-59762 (CVSS 8.7) — When an HTTP/2 profile is configured on a virtual server, undisclosed requests can cause an increase in memory…
    CVE-2026-40423 (CVSS 8.7) — When a SIP profile is configured on a virtual server, undisclosed traffic can cause the Traffic Management Mic…
    CVE-2026-42930 (CVSS 8.5) — When running in Appliance mode, an authenticated attacker assigned the 'Administrator' role may be able to byp…
    CVE-2026-24464 (CVSS 6.9) — When running in Appliance mode, a directory traversal vulnerability exists in an undisclosed iControl REST end…
    CVE-2026-39458 (CVSS 8.7) — When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, A…
    CVE-2026-41959 (CVSS 7.1) — Incorrect permission assignment vulnerabilities exist in BIG-IP and BIG-IQ TMOS Shell (tmsh) network diagnosti…
    CVE-2026-42406 (CVSS 8.5) — A vulnerability exists in BIG-IP and BIG-IQ systems where a highly privileged, authenticated attacker with at …
    CVE-2026-42058 (CVSS 5.3) — An authenticated attacker's undisclosed requests to BIG-IP iControl REST can lead to an information leak of BI…
    CVE-2026-32643 (CVSS 8.5) — A vulnerability exists in BIG-IP and BIG-IQ systems where a highly privileged, authenticated attacker with at …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High