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F5 BIG-IP CVE-2026-39459

| EUVD-2026-29968 HIGH
Least Privilege Violation (CWE-272)
2026-05-13 f5 GHSA-pwjh-hfqc-xgc7
8.6
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

4
Re-analysis Queued
May 13, 2026 - 16:22 vuln.today
cvss_changed
CVSS changed
May 13, 2026 - 16:22 NVD
7.2 (HIGH) 8.6 (HIGH)
Analysis Generated
May 13, 2026 - 15:49 vuln.today
CVE Published
May 13, 2026 - 14:12 nvd
HIGH 7.2

DescriptionNVD

A vulnerability exists in iControl REST and the TMOS Shell (tmsh) where a highly privileged, authenticated attacker with at least the Manager role can create configuration objects that allow running arbitrary commands.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

AnalysisAI

Authenticated attackers with Manager role or higher in F5 BIG-IP can execute arbitrary commands via malicious configuration objects in iControl REST API and TMOS Shell (tmsh). This privilege escalation vulnerability allows administrators to break out of their intended access boundaries and achieve full system control. …

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RemediationAI

Within 24 hours: Identify all F5 BIG-IP instances in your environment and document current firmware versions. Within 7 days: Apply the latest vendor-released patch to all affected BIG-IP systems; contact F5 support or consult security advisories for specific patched versions corresponding to your current firmware branch. …

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CVE-2026-39459 vulnerability details – vuln.today

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