What is CVE-2026-101148?

CVE-2026-101148 is a critical-severity vulnerability in Backupsheep WordPress Backup Plugin, classified under External Control of File Name or Path. CVSS score: 10.0/10. Published 2026-10-01.

How severe is CVE-2026-101148?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Vulnerability in Backupsheep WordPress Backup Plugin

CVE-2026-101148

The BackupSheep WordPress Backup Plugin WordPress plugin through 1.8 does not properly validate its integration key, treating an unset or blank key as valid, which allows unauthenticated attackers to create and download full site backups, including the database with user password hashes, and to delete arbitrary files on the server, leading to sensitive data disclosure and site takeover. The BackupSheep WordPress Backup Plugin WordPress plugin through 1.8 has been closed on WordPress.org since July 2024 and no fixed version is available. Remove it from any site where it is installed.

Published 2026-10-01 · last modified 2026-10-01.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Backupsheep WordPress Backup Plugin

Weakness classification (CWE)

CWE-73 — External Control of File Name or Path

References

wpscan.com/vulnerability/5d6fce13-34e3-4ec6-9b47-a78dd7c94fed/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-101148?: CVE-2026-101148 is a critical-severity vulnerability in Backupsheep WordPress Backup Plugin, classified under External Control of File Name or Path. CVSS score: 10.0/10. Published 2026-10-01.
How severe is CVE-2026-101148?: Critical severity. CVSS v3 base score is 10.0 out of 10.