CVE-2023-6553

CVE-2023-6553 is a critical-severity vulnerability in Backupbliss Backup Migration with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 98% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• EPSS exploit prediction: 98% (100th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-94
• Affected product: Backupbliss Backup Migration
• Published: 2023-12-15
• Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-6553?

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.

How severe is CVE-2023-6553?

CVE-2023-6553 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-6553 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 98% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-6553?

CVE-2023-6553 affects Backupbliss Backup Migration. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-6553?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-6553 published?

CVE-2023-6553 was published on 2023-12-15 and last updated on 2026-06-17.

References

• https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.7/includes/backup-heart.php#L118
• 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/changeset?sfp_email=&sfph_mail=&reponame=&old=3006541%40backup-backup&new=3006541%40backup-backup&sfp_email=&sfph_mail=
• https://www.synacktiv.com/en/publications/php-filters-chain-what-is-it-and-how-to-use-it
• https://www.wordfence.com/threat-intel/vulnerabilities/id/3511ba64-56a3-43d7-8ab8-c6e40e3b686e?source=cve
• http://packetstormsecurity.com/files/176638/WordPress-Backup-Migration-1.3.7-Remote-Command-Execution.html

Affected products (1)

• cpe:2.3:a:backupbliss:backup_migration:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Backupbliss Backup Migration

• CVE-2023-6972 — Critical (CVSS 9.8): The Backup Migration plugin for WordPress is vulnerable to Path Traversal in all versions up to, and including, 1.3.9…
• CVE-2023-6971 — High (CVSS 8.1): The Backup Migration plugin for WordPress is vulnerable to Remote File Inclusion in versions 1.0.8 to 1.3.9 via the…
• CVE-2023-6266 — High (CVSS 7.5): The Backup Migration plugin for WordPress is vulnerable to unauthorized access of data due to insufficient path and…
• CVE-2023-6271 — High (CVSS 7.5): The Backup Migration WordPress plugin before 1.3.6 stores in-progress backups information in easy to find,…
• CVE-2023-7002 — High (CVSS 7.2): The Backup Migration plugin for WordPress is vulnerable to OS Command Injection in all versions up to, and including,…
• CVE-2021-36884 — Medium (CVSS 4.8): Authenticated Persistent Cross-Site Scripting (XSS) vulnerability discovered in WordPress Backup Migration plugin <=…

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Other CWE-94 (Code Injection) vulnerabilities

• CVE-2026-57624 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Blocksy Companion Pro <= 2.1.46 versions.
• CVE-2026-10134 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 allows an attacker to read every secret available to the Langflow process, read…
• CVE-2026-53576 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter…
• CVE-2026-10561 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution combined…
• CVE-2026-25470 — Critical (CVSS 10.0): Improper Control of Generation of Code ('Code Injection') vulnerability in ACPT ACPT (Pro) - Custom Post Types Plugin…
• CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.

Browse all CWE-94 (Code Injection) vulnerabilities →