CVE-2023-6553
CriticalExploitedPublic exploitBackup Migration <= 1.3.7 - Unauthenticated Remote Code Execution
Published Dec 10, 2023 · Updated Apr 8, 2026 · Also known as 3511ba64-56a3-43d7-8ab8-c6e40e3b686e
Key Facts
Patch immediately- CVE-2023-6553 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Backup Migration (Backupbliss), backup-backup (wordpress-plugin), BackupBliss – Backup & Migration with Free Cloud Storage.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Dec 15, 2023. Public exploit code is available.
- EPSS estimates a 98% probability of exploitation in the next 30 days.
- Fixed versions are available, including backup-backup 1.3.8, Backup Migration 1.3.7.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
98%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-6553 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Dec 16, 2023 | n/a | Not reported |
| CIRCL KEV | Dec 15, 2023 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Backup MigrationBackupbliss | See advisory | 1.3.7 |
| backup-backupwordpress-plugin | See advisory | 1.3.8 |
| BackupBliss – Backup & Migration with Free Cloud Storage | See advisory | n/a |
Patched Releases
backup-backup
1.3.8
Backup Migration
1.3.7
Timeline
Publicly disclosed
Dec 10, 2023
Added to CIRCL KEV
Dec 15, 2023
Added to Industry KEV feed
Dec 16, 2023
Last updated
Apr 8, 2026
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/3511ba64-56a3-43d7-8ab8-c6e40e3b686e?source=api-prod
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/3511ba64-56a3-43d7-8ab8-c6e40e3b686e?source=api-scan
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/3511ba64-56a3-43d7-8ab8-c6e40e3b686e?source=cve
- patchhttps://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.7/includes/backup-heart.php#L118
- patchhttps://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.7/includes/backup-heart.php#L38
FAQ
Common Questions.
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.
Affected: Backup Migration (Backupbliss); backup-backup (wordpress-plugin); BackupBliss – Backup & Migration with Free Cloud Storage. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Dec 15, 2023.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including backup-backup 1.3.8, Backup Migration 1.3.7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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