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CVE-2026-75133 – Unauthenticated Database Dump Exposure – Keep Backup Daily WordPress Plugin (< 2.1.

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Summary

CVE-2026-75133 is a missing-authentication vulnerability (CWE-306) in the "Keep Backup Daily" WordPress plugin that allows unauthenticated, remote attackers to trigger a full MySQL database dump and subsequently retrieve the resulting backup file from the site’s publicly accessible uploads directory. The issue affects all plugin versions prior to 2.1.4 and carries a CVSS score of 8.7 (High), reflecting the significant confidentiality impact with no privileges or user interaction required.

Technical details

  • Root cause: The plugin exposes the kbd_cron_process parameter/endpoint without enforcing any authentication or authorization checks, so any unauthenticated visitor can invoke the backup routine.
  • Trigger conditions: An attacker simply issues a network request that reaches the publicly exposed kbd_cron_process parameter on a WordPress site running the vulnerable plugin, forcing it to generate a complete dump of the site’s MySQL database.
  • Attack vector: Network-based (AV:N), requiring no authentication and no user interaction — the vulnerability can be exploited by any remote, unauthenticated party.
  • Impact: Once the dump is created, the resulting backup filename is only weakly randomized — derived from the database name, a limited random value, and a Unix timestamp — making it feasible for an attacker to predict or brute-force the filename and download the backup file directly from the plugin’s publicly reachable uploads directory. This exposes the entire database contents (e.g., user credentials, site configuration, potentially sensitive business data stored in WordPress tables), resulting in a high confidentiality impact with no direct effect on integrity or availability.

Affected software

  • Keep Backup Daily WordPress plugin (developed by Fahad Mahmood) — all versions prior to 2.1.4

Severity

  • CVSS v3.1 Base Score: 7.5 (High) — Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  • CVSS v4.0 Base Score: 8.7 (High) — Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • CWE-306: Missing Authentication for Critical Function

Mitigation and recommended actions

  • Immediate: Update the Keep Backup Daily plugin to version 2.1.4 or later, which restricts access to the backup-generation function and addresses the predictable/exposed filename issue.
  • If immediate patching is not possible:
    • Restrict or disable public access to the plugin’s backup-related endpoints/parameters (e.g., kbd_cron_process) at the web server or WAF layer until the update can be applied.
    • Block direct external access to the WordPress uploads directory for backup file types, or move/relocate backup storage outside of the publicly web-accessible path.
    • Audit existing backup files in the uploads directory for unauthorized access and rotate any credentials or sensitive data that may have been stored in the database if compromise is suspected.
    • Monitor web server logs for anomalous unauthenticated requests referencing kbd_cron_process or unusual downloads of .sql/backup archive files from the uploads path.

References

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