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CVE-2026-56291CriticalCVSS 10.0CVE published 9 July 2026Added to mySites.guru 28 July 2026

Balbooa Forms (com_baforms) <= 2.4.2.1 - Unauthenticated Remote Code Execution (CVSS 10.0) and Arbitrary File Upload

Balbooa Forms up to and including 2.4.2.1 is affected by an unauthenticated remote code execution flaw (CVE-2026-65880, CVSS 4.0 base 10.0, AV:N/AC:L/PR:N/UI:N with high impact on confidentiality, integrity and availability across the security scope). Insecure form processing logic allows code execution on any form that includes the signature field type, with no login and no user interaction. Fixed in Balbooa Forms 2.4.3 - but 2.4.3 is no longer a safe ceiling, because CVE-2026-67364 (pre-auth PHP code injection, CVSS 10.0) and CVE-2026-67363 (pre-auth payment amount tampering, CVSS 7.7) affect 1.0.0 through 2.4.3.1 and were fixed in 2.4.3.2 on 18 August 2026, making 2.4.3.2 the current minimum safe version. This rule also covers two earlier flaws in the same component: CVE-2026-56291, an unauthenticated arbitrary file upload (RCE) in versions up to and including 2.4.0 - the frontend attachment upload accepted a file from any anonymous visitor with no login, no CSRF token and no allow-list on the file extension, and because it trusted the caller-supplied filename a .php upload was written to a public directory (by default images/baforms/uploads/) and could then be executed (CWE-434); and CVE-2025-49485, an SQL injection via the id parameter in 1.0.0 to 2.3.1.1, exploitable by privileged users. Update every Balbooa Forms install to 2.4.3.4 or later, which also includes the further security fixes released on 29 September 2026. Then check the upload folder for stray .php files and the Joomla user list for unfamiliar administrator accounts. Any site that was internet-facing on 2.4.2.1 or earlier with a signature-field form published should be treated as potentially compromised until it has been updated and checked. Also within this rule: CVE-2021-47930 (Balbooa Forms Builder 2.0.6 arbitrary file upload), which sits below this ceiling and needs no separate row.

Is my site affected?

Affected
Balbooa Forms up to and including 2.4.2.1
Fixed in
A release after 2.4.2.1
What to do
Update Balbooa Forms to the newest release from the vendor. This flaw covers versions up to 2.4.2.1, so any later release is outside it.
Check whether your sites are affected

How CVE-2026-56291 is scored

The base metrics as Joomla CNA published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

10.0 Critical

CVSS 4.0, scored by Joomla CNA
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/E:A/AU:Y/U:Red

How it is reached

AV:N Attack vector
Network. Reachable across the internet
AC:L Attack complexity
Low. Nothing to work around, it just works
AT:N Attack requirements
None. Works against any affected install
PR:N Privileges required
None. No account needed
UI:N User interaction
None. Nobody has to be tricked into anything

What it does to the site

VC:H Confidentiality
High. Everything the site holds can be read
VI:H Integrity
High. Data and files can be altered at will
VA:H Availability
High. The site can be taken down

What it does beyond the site

SC:H Confidentiality
High. Data on other systems can be read
SI:H Integrity
High. Other systems can be altered
SA:H Availability
High. Other systems can be taken down

Timeline

  1. 9 July 2026CVE-2026-56291 record published by its CNA
  2. 28 July 2026mySites.guru check added for Balbooa Forms (up to and including 2.4.2.1)

Rule details

Other vulnerabilities in Balbooa Forms

Updating for CVE-2026-56291 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

Balbooa Forms

Latest safe version: 2.4.3.4

All 10 CVEs in Balbooa Forms

References

CVE-2026-56291 questions

Which versions are affected by CVE-2026-56291?
CVE-2026-56291 affects Balbooa Forms up to and including 2.4.2.1.
How do I fix CVE-2026-56291?
Update Balbooa Forms to the newest release from the vendor. This flaw covers versions up to 2.4.2.1, so any later release is outside it.
How severe is CVE-2026-56291?
Joomla CNA scores it 10.0 (Critical) under CVSS 4.0. In plain terms: reachable across the internet, no account needed and nobody has to be tricked into anything.

Running an affected version on a site you manage?

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This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.

Rules current as of 5 October 2026.