CVE-2023-6553Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via attacker-controlled include path

Published Dec 15, 2023 · Updated Apr 8, 2026

Code injection in Clever Widgets Backup Migration 1.3.7 and earlier allows remote attackers to execute PHP code without authentication. The backup-heart.php endpoint derives BMI_ROOT_DIR from the content-dir HTTP header and includes bypasser.php from the resulting attacker-controlled path. No account or user interaction is required; commands run in the WordPress instance's security context and can compromise the site.

CVSS severity9.8
Critical
EPSS probability97.85%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Clever Widgets Backup Migration 1.3.7 and earlier allows remote attackers to execute PHP code without authentication. The backup-heart.php endpoint derives BMI_ROOT_DIR from the content-dir HTTP header and includes bypasser.php from the resulting attacker-controlled path. No account or user interaction is required; commands run in the WordPress instance's security context and can compromise the site.

The record

CVE
CVE-2023-6553
Published
Dec 15, 2023
Updated
Apr 8, 2026
Vendor
Copy Delete Posts
Product
Backup Migration
Classifications
CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.3.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Copy Delete Posts · Backup Migrationversion=0 <=1.3.7

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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