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CVE-2026-66842— BIG-IP and BIG-IQ Configuration utility vulnerability

Quick assessment

Affected
F5 BIG-IP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BIG-IP 存在一个漏洞，任何角色的经过认证的用户都可能通过向流量管理用户界面（TMUI）发送一个未公开的请求来创建管理员账户。 影响： 该漏洞可能允许一个已认证且能够访问 BIG-IP 管理接口的攻击者，通过在 BIG-IP 系统上创建管理员账户来提升权限。此漏洞仅涉及控制平面，不涉及数据平面。 备注： 已达到技术支持终止期（End of Technical Support, EoTS）的软件版本未纳入评估范围。

CVSS 8.8 · High
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I. Basic Information for CVE-2026-66842

Vulnerability Information
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Vulnerability Title
BIG-IP and BIG-IQ Configuration utility vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 BIG-IP 21.1.0 ~ 21.1.0.1 -
F5 BIG-IQ 8.4.0 ~ 8.4.2.1 -

II. Public POCs for CVE-2026-66842

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III. Intelligence Information for CVE-2026-66842

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Other References for CVE-2026-66842 (1)

Same Patch Batch · F5 · 2026-09-02 · 7 CVEs total

CVE-2026-77180 8.3 HIGH NGINX Ingress Controller vulnerability
CVE-2026-18329 8.2 HIGH NGINX ngx_http_js_module vulnerability
CVE-2026-78689 8.1 HIGH NGINX ngx_http_js_module vulnerablility
CVE-2026-66362 8.1 HIGH NGF vulnerability
CVE-2026-78222 7.5 HIGH NGINX ngx_http_js_module vulnerability
CVE-2026-63020 3.1 LOW BIG-IP Configuration utility vulnerability

IV. Related Vulnerabilities

Same product: BIG-IP
Same vendor: F5
Same weakness: CWE-918

V. Comments for CVE-2026-66842

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