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Backup Backup - Cross-Site Scripting (XSS) (CVE-2021-36884)

CVE-2021-36884

Vulnerability CVE-2021-36884 PLUGIN backup-backup MEDIUM

Authenticated Persistent Cross-Site Scripting (XSS) vulnerability discovered in WordPress Backup Migration plugin

CVE-2021-36884

MEDIUM CVSS 4.8 Published 2021-11-19 Updated 2026-06-17
AI Risk Moderate (42/100) Active Exploit: No strong signal Published Exploit: No public exploit references Priority: P4 Planned
Severity Band MEDIUM
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Affected Components 2
Reference Links 2
AI Risk Engine Moderate (42/100)
Exploitability Low
Active Exploitation No strong signal
Published Exploit Status No public exploit references

Threat Timeline

  1. 2021-11-19 CVE published and first recorded in the threat feed.
  2. 2026-06-17 Record updated with latest vulnerability metadata.
  3. 2026-04-12 AI technical context refreshed for mitigation and impact guidance.
  4. Now Monitoring for follow-up changes, linked references, and new related CVEs.

AI Context

Machine-generated threat intelligence

AI Updated 163 days ago

AI enriched 163 days ago (2026-04-12 02:15 UTC)

Technical Summary

Authenticated Persistent Cross-Site Scripting (XSS) vulnerability discovered in WordPress Backup Migration plugin

Potential Impact

Severity is MEDIUM (CVSS 4.8). Depending on deployment context, affected components may be exposed to unauthorized actions or data integrity risk.

Exploitability Assessment

Exploitability is assessed as Low based on severity and technical exposure profile.

Primary risk drivers: severity and technical exposure profile

Mitigation Recommendations

Validate affected product versions, prioritize patching, and monitor references for vendor remediation guidance. If immediate patching is not possible, apply compensating controls and limit exposure of vulnerable surfaces.

Detection & Monitoring

Track authentication anomalies, unexpected file writes, and suspicious plugin API activity around affected components.

Business Impact Lens

AI risk score 42/100 (Moderate, Low) with priority P4 Planned. Prioritize remediation where affected components process customer data, admin sessions, or Internet-exposed workflows.

Affected Products

Backup Backup PLUGIN · backup-backup Affected range not specified Fixed version not specified
Backup Migration PLUGIN · backup-migration Affected: <= 1.1.5 Fixed version not specified

Related Vulnerabilities

Browse All Threats

Newest linked vulnerabilities to keep visitors exploring adjacent CVE coverage.

Backup Backup - Security Vulnerability (CVE-2026-7693) CVE-2026-7693 Published 2026-08-05 Backup Backup - Security Vulnerability (CVE-2026-39480) CVE-2026-39480 Published 2026-06-15 Backup Backup - Broken Access Control (CVE-2025-14944) CVE-2025-14944 Published 2026-04-07 Backup Backup - PHP Object Injection (CVE-2024-10932) CVE-2024-10932 Published 2025-01-04 Backup Backup - Information Disclosure (CVE-2023-6266) CVE-2023-6266 Published 2024-01-11 Backup Backup - Remote Code Execution (CVE-2023-6972) CVE-2023-6972 Published 2023-12-23

References

What to do about this

Patch on your next cycle Worth fixing, but not ahead of other work.

Fix it

Update Backup Backup to the latest available version.

Where the vendor has not published a fix yet, disable the plugin until they do.

Cannot update today? Request / payload inspection (WAF) in Hack Halt ProSecure blocks this class of attack before WordPress processes the request.

Inspect request parameters and bodies for injection, traversal and file-inclusion payloads, and refuse the request rather than logging it.

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Not sure if you are affected?

Scan your site to see whether it runs Backup Backup, and at which version.

Free, no installation, no account. It reads what your site already publishes, then tells you which plugins carry known vulnerabilities and what to do about each one.

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Am I affected by this vulnerability?

You are affected if your site runs Backup Backup.

How do I fix it?

Update Backup Backup to the latest available version. Where the vendor has not yet published a fix, remove or disable the plugin until they do. Until you can update, Request / payload inspection (WAF) in Hack Halt ProSecure contains this class of attack at the request layer.

What can an attacker actually do?

This is a Cross-Site Scripting (XSS) flaw. An attacker who exploits it can run script in a visitor's browser, stealing sessions or planting an administrator account.

WordPress security that blocks attacks before they land.

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