CVE-2021-47979

Description

WordPress Plugin Backup and Restore 1.0.3 contains an arbitrary file deletion vulnerability that allows authenticated attackers to delete files by manipulating parameters in AJAX requests. Attackers can send POST requests to admin-ajax.php with crafted file_name and folder_name parameters to delete arbitrary files from the WordPress installation directory.

Overview

State

—

Assigner (CNA)

—

CVSS severity

high

CVSS score

8.8 / 10

CVSS vector

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

Effective score

8.8 / 10 HIGH source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2021-47979

Linked Threat

CVE-2021-47979 — Backup and Restore plugin – WordPress <= 1.0.3 - Authenticated (Subscriber+) Arbitrary File Deletion

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2026-05-16 16:16:23 UTC

NVD last modified

2026-05-18 17:05:46 UTC

NVD CVSS v3.1

8.8 / 10 HIGH source: disclosure@vulncheck.com

NVD CVSS vector

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

Exploitability subscore

2.8 / 10

Impact subscore

5.9 / 10

EPSS score

0.0006 (probability of exploitation in next 30 days)

EPSS percentile

17.13% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD-assigned CWE(s): CWE-22 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2021-34834

Assigner

VulnCheck

Published

May 16, 2026, 3:26:19 PM

Updated

May 18, 2026, 12:39:23 PM

EUVD base score (CVSS 4.0)

8.7 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EUVD-reported EPSS

0.0600

Vendors

miniorange

Products

Backup and Restore (1.0.3)

Aliases

GHSA-jg68-hr29-3cm4

ENISA description: WordPress Plugin Backup and Restore 1.0.3 contains an arbitrary file deletion vulnerability that allows authenticated attackers to delete files by manipulating parameters in AJAX requests. Attackers can send POST requests to admin-ajax.php with crafted file_name and folder_name parameters to delete arbitrary files from the WordPress installation directory.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (7)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://nvd.nist.gov/vuln/detail/CVE-2021-47979 tenable:nvd.nist.gov
• https://wordpress.org/plugins/backup-and-restore-for-wp/ tenable:wordpress.org
• https://www.cve.org/CVERecord?id=CVE-2021-47979 tenable:www.cve.org
• https://www.exploit-db.com/exploits/50503 tenable:www.exploit-db.com
• https://www.first.org/epss/ tenable:www.first.org
• https://www.miniorange.com/ tenable:www.miniorange.com
• https://www.vulncheck.com/advisories/wordpress-plugin-backup-and-restore-arbitrary-file-deletion tenable:www.vulncheck.com

Indicators (1)

IOCs linked to the auto-promoted Threat row.

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

• Wordfence remediation: Backup and Restore plugin – WordPress
  Wordfence

  No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.

  2026-07-30 02:53 UTC
• Nvd - Cve-2025-47979
  web:nvd.nist.gov

  An official website of the United States government Here's how you know

  2026-05-26 02:55 UTC
• Critical Patches Issued for Microsoft Products, May 12, 2026
  web:www.cisecurity.org

  <p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...

  2026-05-26 02:55 UTC
• Microsoft Update Warning—Windows 11 Security Fix Breaks Backups - Forbes
  web:www.forbes.com

  Windows 11 users are warned that backups are broken across multiple third-party applications after another Microsoft security update brings unexpected consequences.

  2026-05-26 02:55 UTC
• Registry hack lets you bypass Windows 11 KB5083769, KB5083631 patch ...
  web:www.neowin.net

  Microsoft earlier confirmed that its latest Windows 11 updates under KB5083769 and KB5083631 have new entries in its blocklist. A Registry fix can unpatch it.

  2026-05-26 02:55 UTC
• Security Update Guide - Microsoft
  web:msrc.microsoft.com

  The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

  2026-05-26 02:55 UTC
• Windows 11 KB5083769 April 2026 Patch Tuesday Update Released
  web:www.prajwaldesai.com

  Microsoft's KB5083769 update for Windows 11 fixes "Reset this PC" errors, boosts SMB compression reliability over QUIC, and enhances phishing defenses for .rdp files.

  2026-05-26 02:55 UTC
• CVE-2021-47979 - Tenable
  web:www.tenable.com

  WordPress Plugin Backup and Restore 1.0.3 contains an arbitrary file deletion vulnerability that allows authenticated attackers to delete files by manipulating parameters in AJAX requests. Attackers can send POST requests to admin-ajax.php with crafted file_name and folder_name parameters to delete arbitrary files from the WordPress installation directory.

  2026-05-26 02:55 UTC
• Windows 11 KB5083769 update triggers BitLocker recovery | Windows Central
  web:www.windowscentral.com

  A faulty BitLocker configuration is forcing some PCs into BitLocker recovery mode after the April 2026 update, but there's a workaround to resolve this issue.

  2026-05-26 02:55 UTC
• Microsoft confirms Windows 11 KB5083769 issues, BitLocker alert on a ...
  web:www.windowslatest.com

  Mayank Parmar - April 19, 2026 Windows 11 KB5083769 is not a big update, but on a few PCs, it could trigger a BitLocker recovery screen alert, and Microsoft says it's already rolling out a fix .

  2026-05-26 02:55 UTC
• Windows 11 KB5083769 is breaking Acronis, Macrium, and other backup ...
  web:www.notebookcheck.net

  Windows 11 KB5083769 is blocking the psmounterex.sys driver used by Macrium Reflect and Acronis, causing backup failures and VSS timeouts on 24H2 and 25H2.

  2026-05-26 02:55 UTC

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