What is CVE-2026-27384?

CVE-2026-27384 is a critical-severity vulnerability in Boldgrid W3 Total Cache, classified under Improper Validation of Specified Quantity in Input. CVSS score: 9.0/10. Published 2026-03-05.

How severe is CVE-2026-27384?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Is CVE-2026-27384 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Boldgrid W3 Total Cache

CVE-2026-27384

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.

EPSS: 0.001 (26.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Boldgrid W3 Total Cache — versions 0

Weakness classification (CWE)

CWE-1284 — Improper Validation of Specified Quantity in Input

Public proof-of-concept exploits

xxconi/CVE-2026-27384

References

patchstack.com/database/Wordpress/Plugin/w3-total-cache/vulnerability/wordpress… (vdb-entry)

Frequently asked questions

What is CVE-2026-27384?: CVE-2026-27384 is a critical-severity vulnerability in Boldgrid W3 Total Cache, classified under Improper Validation of Specified Quantity in Input. CVSS score: 9.0/10. Published 2026-03-05.
How severe is CVE-2026-27384?: Critical severity. CVSS v3 base score is 9.0 out of 10.
Is CVE-2026-27384 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.