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CVE-2026-65880 – Unauthenticated RCE via Signature Field – Balbooa Forms for Joomla (all versions…

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Summary

CVE-2026-65880 is a critical unauthenticated remote code execution vulnerability in Balbooa Forms, a form-builder extension for the Joomla CMS developed by balbooa.com. The flaw resides in insecure form processing logic that is triggered when a form includes the signature field type, enabling a fully unauthenticated remote attacker to execute arbitrary code on the underlying server. The vulnerability carries a maximum CVSS 4.0 score of 10.0, with no complexity, no required privileges, no user interaction, and full impact on confidentiality, integrity, and availability of both the affected system and its surrounding environment.

Technical details

  • Root cause: Insecure form processing logic (CWE-94: Improper Control of Generation of Code / Code Injection) that is triggered when a submitted form contains the signature field type.
  • Trigger conditions: Any publicly accessible Joomla form that includes a signature field can be exploited by submitting a crafted request — no user account, login session, or prior knowledge of site internals is required.
  • Attack vector: Fully remote and unauthenticated. The Balbooa Forms component is registered as com_baforms within Joomla and renders on public-facing pages, making it directly reachable by any network attacker.
  • Impact: Successful exploitation results in remote code execution on the host server, enabling full system compromise including data exfiltration, web shell deployment, and lateral movement within the hosting environment.

Affected software

  • Balbooa Forms for Joomla — all versions from 1.0.0 through 2.4.2.1 (all versions prior to 2.4.3)

Note for organizations that previously patched CVE-2026-56291: That earlier Balbooa Forms vulnerability was addressed in version 2.4.1 (released July 9, 2026). Versions 2.4.1 and 2.4.2 remain fully exposed to CVE-2026-65880. Upgrading to 2.4.3 is required.

Severity

CVSS 4.0 base score: 10.0 (Critical)
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

A CVSS v3.1 score has not been published in the official CVE record; the CVSS 4.0 score above is the authoritative severity rating for this vulnerability.

Mitigation and recommended actions

  • Immediate action: Upgrade Balbooa Forms to version 2.4.3 or later. This is required for all deployments, including those already running 2.4.1 or 2.4.2.
  • If immediate patching is not possible:
    • Temporarily disable forms that use the signature field type until the upgrade can be applied.
    • Apply web application firewall (WAF) rules to restrict or monitor requests to the com_baforms component endpoint from untrusted external sources.
    • Restrict public access to affected form pages at the network or application layer as an interim control.

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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