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8.8 High

CVE-2026-66842 BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts…

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.

Affected products and versions

Product Affected versions Fixed in
BIG-IP 21.1 21.1.0 → < 21.1.0.1 21.1.0.1
BIG-IP 21.0 21.0.0 → < 21.0.0.3 21.0.0.3
BIG-IP 17.5 17.5.0 → < 17.5.1.8 17.5.1.8
BIG-IP 17.1 17.1.0 → < 17.1.3.4 17.1.3.4
BIG-IQ 8.4 8.4.0 → < 8.4.2.1 8.4.2.1

References

Timeline

  1. Published
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Other CVEs of BIG-IP

The 259 CVEs of BIG-IP →
CVE-2026-94127 F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability 9.8 Critical CVE-2026-63020 A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof error… 3.1 Low CVE-2026-59762 When an HTTP/2 profile is configured on a virtual server, undisclosed requests can cause an increase in memory… 7.5 High CVE-2026-40423 When a SIP profile is configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel… 7.5 High
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