CVE-2026-66842
published 2026-09-02CVE-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…
PriorityP262high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
0.28%
20.3th percentile
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
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| f5 | big-ip | — | — |
| f5 | big-ip | >= 17.1.0 < 17.1.3.4 | 17.1.3.4 |
| f5 | big-ip | >= 17.5.0 < 17.5.1.8 | 17.5.1.8 |
| f5 | big-ip | >= 21.0.0 < 21.0.0.3 | 21.0.0.3 |
| f5 | big-ip | >= 21.1.0 < 21.1.0.1 | 21.1.0.1 |
| f5 | big-iq | >= 8.4.0 < 8.4.2.1 | 8.4.2.1 |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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F5
CVE-2026-66842: BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts...
vendor_f5·2026-09-02·CVSS 8.8
CVE-2026-66842 [HIGH] CWE-918 CVE-2026-66842: BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts...
CVE-2026-66842: BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts...
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: BIG-IP
F5 Advisory Articles: K000162521
F5 References: https://my.f5.com/manage/s
GHSA
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).
ghsa_unreviewed·2026-09-02
CVE-2026-66842 [HIGH] CWE-918 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).
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.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-09-02
Published