What is the CVSS score of CVE-2026-27384?

CVE-2026-27384 has a CVSS 3.1 base score of 9.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Input are affected by CVE-2026-27384?

A critical vulnerability in W3 Total Cache (versions ≤2.9.1) allows unauthenticated attackers to bypass access controls and access restricted functionality, potentially exposing sensitive website…

How to fix or mitigate CVE-2026-27384?

Within 24 hours: Audit all sites running W3 Total Cache ≤2.9.1 and document affected instances. Within 7 days: Implement compensating controls listed below; consider temporarily disabling the plugin on non-critical sites if updates are unavailable. Within 30 days: Prioritize migration to patched versions when available or transition to alternative caching solutions; maintain continuous monitoring for vendor patch releases.

Input CVE-2026-27384

CRITICAL

Improper Validation of Specified Quantity in Input (CWE-1284)

2026-03-05 audit@patchstack.com

Information Disclosure

9.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.0 CRITICAL

AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Re-analysis Queued

Apr 22, 2026 - 21:37 vuln.today

cvss_changed

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

CVE Published

Mar 05, 2026 - 06:16 nvd

CRITICAL 9.0

DescriptionCVE.org

Improper Validation of Specified Quantity in Input vulnerability in BoldGrid W3 Total Cache w3-total-cache allows Accessing Functionality Not Properly Constrained by ACLs.This issue affects W3 Total Cache: from n/a through <= 2.9.1.