CVE-2023-6553

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-12-15. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 98%
  • Public exploit code is available (Metasploit, ssvc poc, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 98%CVSS: 9.8Exploit: Metasploit · ssvc poc · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
98(Attend)
EG Risk 98/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation98% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
98%
EPSS %ILE
100%
KEV
Not listed

Published

December 15, 2023

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Aug 2, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

PHP filters chain: What is it and how to use it

https://www.synacktiv.com/en/publications/php-filters-chain-what-is-it-and-how-to-use-it

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 0× in last 7d / 5× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 02:30 UTCEG score recompute
  2. 2026-07-22 23:17 UTCEG score recompute
  3. 2026-07-22 14:07 UTCEPSS rescore
  4. 2026-07-22 14:07 UTCEPSS rescore
  5. 2026-07-11 08:26 UTCEPSS rescore
  6. 2026-06-25 13:48 UTCEPSS rescore
  7. 2026-06-25 13:48 UTCEPSS rescore
  8. 2026-06-23 21:31 UTCEPSS rescore
  9. 2026-06-23 21:31 UTCEPSS rescore
  10. 2026-06-21 01:58 UTCEPSS rescore
  11. 2026-06-21 01:58 UTCEPSS rescore
  12. 2026-06-19 19:24 UTCEPSS rescore
  13. 2026-06-19 19:24 UTCEPSS rescore
  14. 2026-06-15 17:47 UTCEPSS rescore
  15. 2026-06-13 22:59 UTCEPSS rescore
  16. 2026-06-13 22:59 UTCEPSS rescore
  17. 2026-06-08 14:16 UTCEPSS rescore
  18. 2026-06-08 14:16 UTCEPSS rescore
  19. 2026-06-07 15:24 UTCEPSS rescore
  20. 2026-06-07 15:24 UTCEPSS rescore
  21. 2026-06-05 22:46 UTCEPSS rescore
  22. 2026-06-05 22:46 UTCEPSS rescore
  23. 2026-06-02 20:12 UTCEPSS rescore
  24. 2026-06-02 20:12 UTCEPSS rescore
  25. 2026-06-01 13:51 UTCEPSS rescore
Show 19 more
  1. 2026-05-29 13:43 UTCEPSS rescore
  2. 2026-05-26 13:43 UTCEPSS rescore
  3. 2026-05-26 13:43 UTCEPSS rescore
  4. 2026-05-22 21:16 UTCEPSS rescore
  5. 2026-05-22 21:16 UTCEPSS rescore
  6. 2026-05-22 21:16 UTCEPSS rescore
  7. 2026-05-22 21:16 UTCEPSS rescore
  8. 2026-05-22 21:16 UTCEPSS rescore
  9. 2026-05-22 05:27 UTCEG score recompute
  10. 2026-05-22 05:27 UTCGHSA enrichment
  11. 2026-05-20 11:21 UTCEPSS rescore
  12. 2026-05-20 11:21 UTCEPSS rescore
  13. 2026-05-20 11:21 UTCEPSS rescore
  14. 2026-05-20 11:21 UTCEPSS rescore
  15. 2026-05-20 11:21 UTCEPSS rescore
  16. 2026-05-18 21:30 UTCEPSS rescore
  17. 2026-05-18 21:30 UTCEPSS rescore
  18. 2026-05-18 21:30 UTCEPSS rescore
  19. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(6 references)

Working exploit code is in the public domain (1 Metasploit module) (3 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoC0x00phantom-hat/CVE-2023-6553-RCE-Exploit
    First seen Apr 10, 2026

    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.

    Open source ↗
  • Exploit-DBEDB-52486
    First seen Mar 3, 2026

    WordPress Backup Migration 1.3.7 - Remote Command Execution

    Open source ↗
  • GitHub PoCmotikan2010/CVE-2023-6553-PoC
    First seen Dec 27, 2023
    Open source ↗
  • GitHub PoCChocapikk/CVE-2023-6553
    First seen Dec 13, 2023

    Backup Migration <= 1.3.7 - Unauthenticated Remote Code Execution

    Open source ↗
  • Metasploitexploit/multi/http/wp_backup_migration_php_filter✓ verified
    First seen Dec 11, 2023

    WordPress Backup Migration Plugin PHP Filter Chain RCE

    Open source ↗
  • Nucleihttp/cves/2023/CVE-2023-6553.yaml
    First seen Jan 1, 2023

    Worpress Backup Migration <= 1.3.7 - Unauthenticated Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-6553?
CVE-2023-6553 is a critical vulnerability published on December 15, 2023. 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…
When was CVE-2023-6553 disclosed?
CVE-2023-6553 was first published in the National Vulnerability Database on December 15, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-6553 actively exploited?
CVE-2023-6553 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98% probability of exploitation in the next 30 days, which ranks it in the top 0.1% of all scored CVEs.
What is the CVSS score of CVE-2023-6553?
CVE-2023-6553 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-6553?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-6553, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2023-6553

Explore →

Is Your Infrastructure Affected by CVE-2023-6553?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs