What is CVE-2023-6553?

CVE-2023-6553 is a critical-severity vulnerability in Backupbliss Backup Migration, classified under Code Injection. CVSS score: 9.8/10. Published 2023-12-15.

How severe is CVE-2023-6553?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-6553 known to be exploited?

47 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Backupbliss Backup Migration

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.

Vulnerability class: RCE (Remote Code Execution)

Published 2023-12-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.978 (99.9th percentile), scored 2026-10-16.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.978 · newest: 0.978 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-94 — Code Injection

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2023-6553?: CVE-2023-6553 is a critical-severity vulnerability in Backupbliss Backup Migration, classified under Code Injection. CVSS score: 9.8/10. Published 2023-12-15.
How severe is CVE-2023-6553?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-6553 known to be exploited?: 47 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.