CVE-2026-42930

High

Published: 13 May 2026

Published

13 May 2026

Modified

13 May 2026

KEV Added

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Patch

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CVSS Score v4 8.5 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

EPSS Score 0.0048 37.9th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-42930 is a high-severity Path Traversal: '.../...//' (CWE-35) vulnerability. Its CVSS base score is 8.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 37.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-30007

Vulnerability details

When running in Appliance mode, an authenticated attacker assigned the 'Administrator' role may be able to bypass Appliance mode restrictions on a BIG-IP system. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE(s): CWE-35

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

T1548 Abuse Elevation Control Mechanism Privilege Escalation

Adversaries may circumvent mechanisms designed to control privilege elevation to gain higher-level permissions.

attack.mitre.org →

Why these techniques?

Bypass of Appliance mode restrictions by authenticated admin directly enables privilege escalation via abuse of elevation control mechanisms on the restricted F5 BIG-IP environment.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0