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CVE Record

CVE-2026-56291: Joomla Extension - balbooa.com - Unauthenticated file upload in Balbooa Forms extension < 2.4.1

The Joomla extension Balbooa Forms is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.

CriticalCVSS 10Known exploitedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2026-56291 is a critical flaw in the Joomla Balbooa Forms extension. Unauthenticated attackers can upload executable files, which can lead to full remote code execution on the website. CISA KEV listing indicates known exploitation. Joomla sites using Balbooa Forms 1.0 through 2.4.0 should be treated as urgent exposure.

Executive priority

Immediate action is recommended. This is a critical, remotely exploitable website takeover risk with known exploitation. Patch or disable affected Balbooa Forms deployments as a priority, especially on public Joomla sites that support customer, payment, or brand-facing workflows.

Technical view

The issue is CWE-434 unrestricted upload of dangerous files in Balbooa Forms for Joomla versions 1.0-2.4.0. The CVE describes unauthenticated arbitrary executable file upload leading to full RCE. CVSS 4.0 score is 10.0 with network attack vector, low complexity, no privileges, and no user interaction.

Likely exposure

Internet-facing Joomla sites with Balbooa Forms versions 1.0 through 2.4.0 are likely exposed. Sites not using the extension, or using versions outside the affected range, are not indicated as affected by the provided sources.

Exploitation context

CISA KEV status supports that this CVE is known to be exploited. The provided sources do not describe attacker volume, targeting, indicators of compromise, or specific exploit chains. Because exploitation is unauthenticated and remote, exposed public sites carry high business risk.

Researcher notes

Evidence is strong for affected product, version range, vulnerability class, and KEV status. Public source bundle does not provide exploit artifacts, IOCs, or detailed vulnerable endpoint information. Avoid relying on generic Joomla hardening as a substitute for updating or disabling the affected extension.

Mitigation direction

  • Identify all Joomla sites using Balbooa Forms.
  • Upgrade Balbooa Forms to version 2.4.1 or later.
  • If upgrade is not immediately possible, disable the extension pending vendor guidance.
  • Review vendor and third-party advisory guidance for current remediation details.
  • Prioritize internet-facing production sites and high-value domains first.

Validation and detection

  • Inventory Joomla extensions and confirm Balbooa Forms version.
  • Verify affected versions 1.0 through 2.4.0 are no longer deployed.
  • Check CISA KEV entry for required remediation timelines.
  • Review web server and Joomla logs for suspicious uploads.
  • Confirm file upload directories contain no unexpected executable files.
Prepared
Confidence
high
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-434: File access and web shell behavior lookup

File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
description · low confidence lookup

File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-56291 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Critical
CVSS
10 (4.0)
Known Exploited
Yes
Published

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/E:A/AU:Y/U:Red

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
1ADP providers
4Source links

CISA KEV status

Status
Known exploited
Source
CISA-ADP
Date added
KEV reference

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: activeAutomatable: yesTechnical Impact: total

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
10CVSS 4.0CriticalCVSS: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——Joomla

Vulnerability scoring details

Base CVSS 4.0 score

10Critical
CVSS 4.0 vector shape for CVE-2026-56291Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

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/E:A/AU:Y/U:Red

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. Added to KEVCISA-ADP

    CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.

  4. ADP timelineCISA-ADP

    CVE-2026-56291 added to CISA KEV

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvcother:kev
  • 2026-07-10T00:00:00.000Z: CVE-2026-56291 added to CISA KEV

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
balbooa.combalbooa.com Balbooa Forms extension for Joomla1.0-2.4.0unaffected
Weakness

CWE details

CWE-434

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.