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F5 BIG-IP CVE-2026-40631

| EUVD-2026-29978 HIGH
Files or Directories Accessible to External Parties (CWE-552)
2026-05-13 f5 GHSA-v83q-vrmw-32xv
8.5
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:N/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
8.7 (HIGH) 8.5 (HIGH)
Analysis Generated
May 13, 2026 - 15:48 vuln.today
CVE Published
May 13, 2026 - 14:12 nvd
HIGH 8.7

DescriptionNVD

An authenticated attacker with the Resource Administrator or Administrator role can modify configuration objects through iControl SOAP resulting in privilege escalation.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

AnalysisAI

Privilege escalation in F5 BIG-IP allows authenticated Resource Administrators to gain full Administrator privileges by exploiting insecure iControl SOAP API configuration handling. Attackers with high-privilege Resource Administrator access can modify configuration objects to escalate to Administrator level, achieving cross-scope access to confidential data and integrity compromise. …

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RemediationAI

Within 24 hours: Identify and inventory all F5 BIG-IP deployments and current firmware versions; restrict iControl SOAP API access to essential Resource Administrator accounts only. Within 7 days: Apply vendor-released patch to all BIG-IP systems; verify successful patch installation across all nodes. …

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CVE-2026-40631 vulnerability details – vuln.today

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