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CVE-2026-56035 – Unauthenticated Multiple Vulnerabilities – BitFire Security WordPress Plugin ≤ 5…

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Summary

CVE-2026-56035 describes multiple unauthenticated vulnerabilities affecting the BitFire Security WordPress plugin (versions ≤ 5.0.3), developed by Cory Marsh. The flaws are rooted in improper validation of specified quantity in input (CWE-1284) and are remotely exploitable without any authentication or user interaction, earning a CVSS 3.1 base score of 8.6 (High). BitFire Security is a WordPress security plugin offering firewall, malware scanning, bot blocking, and login protection capabilities — the vulnerabilities thus allow attackers to bypass the very protections the plugin is designed to enforce.

Technical details

  • Root cause: Improper validation of specified quantity in input (CWE-1284), enabling attackers to supply out-of-range or malformed values that the plugin fails to adequately constrain or reject.
  • Trigger conditions: No authentication, no user interaction, and no special privileges are required. The vulnerabilities are exploitable by any network-accessible attacker against an internet-facing WordPress site running the affected plugin version.
  • Attack vector: Network (AV:N), low complexity (AC:L). Exploitation does not depend on a race condition or any precondition beyond plugin presence.
  • Impact: HIGH confidentiality impact — attackers may access sensitive information processed or stored by the plugin or the underlying WordPress installation. LOW integrity and availability impact are also assessed, indicating potential for limited data manipulation or service disruption.
  • Classification: CAPEC-1 (Accessing Functionality Not Properly Constrained by ACLs), indicating the flaws allow access to functionality that should be restricted to authenticated or privileged users.

Affected software

  • BitFire Security WordPress plugin, all versions up to and including 5.0.3
  • Developed by: Cory Marsh (plugin slug: bitfire)
  • Hosted on: WordPress Plugin Directory

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

Mitigation and recommended actions

  • Immediate: Upgrade the BitFire Security plugin to version 5.0.4 or later. Version 5.0.4 is the first patched release; the current version available in the WordPress Plugin Directory is 5.0.7. Updates can be applied directly from the WordPress admin dashboard under Plugins → Updates.
  • If immediate patching is not possible: Consider temporarily deactivating the BitFire Security plugin to eliminate the attack surface, and apply strict network-level access controls to restrict HTTP/HTTPS access to the WordPress installation from untrusted sources until the patch can be applied.
  • Monitor WordPress admin and server logs for unexpected unauthenticated requests to plugin endpoints under /wp-content/plugins/bitfire/.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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