Vulnerability report

Active exploitation observed Confirmed confidence In CISA KEV

CVE-2026-56291

balbooa.com Balbooa Forms extension for Joomla Arbitrary File Access

Balbooa.com Balbooa Forms extension for Joomla · 1.0-2.4.0

Watch CVE-2026-56291 Browse KEV feed
Severity
CVSS 10.0 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
14.9%
First observed
08 Aug 2026
Last observed
10 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-56291 is an unauthenticated vulnerability affecting balbooa.com Balbooa Forms extension for Joomla. Joomla Extension - balbooa.com - Unauthenticated file upload in Balbooa Forms extension < 2.4.1 - The Joomla...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

balbooa.com Balbooa Forms extension for Joomla 1.0-2.4.0.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

balbooa.com Balbooa Forms extension for Joomla Arbitrary File Access

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.

balbooa.com Affected
balbooa.com Balbooa Forms extension for Joomla
1.0-2.4.0
View vendor advisory (opens in new tab)
Published
09 Jul 2026
Exploitation Reported
10 Jul 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

joomla cisa nuclei_scanner

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 10 Jul 2026

A trusted third party reported exploitation.

Active exploitation observed

Previdian sensor

First observed 08 Aug 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Proof of concept available

GitHub

Recorded 13 Jul 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CISA First 2026-07-10 17:00 UTC
CVE 2026-07-10 17:51 UTC
All CISA Advisories 2026-07-10 18:20 UTC
Previdian Sensors 2026-08-09 15:24 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

14

Attempts observed

11

Unique attacker IPs

7

Attacker countries

BG · CH · FR · NL · SC · US · YE

9

Sensors observed

CVE-2026-56291 exploitation attempts over the last 66 days

Daily events observed by Previdian sensors

Updated 11 Oct 2026

0
1
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
1
3
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
1
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
0
7 Aug 21 Aug 4 Sep 18 Sep 11 Oct

First observed 08 Aug 2026 · Last observed 10 Oct 2026

Pro adds sensor region and window summaries. Enterprise adds raw IPs, paths, User-Agents, and payloads.

Start 14-day Pro trial

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
1
5
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

Learn about Pro API access

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-56291.yaml 19 Jul 2026

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

10.0 Critical

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

14.9%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Unrestricted Upload of File with Dangerous Type CWE-434

Recent mention · All CISA Advisories

CISA Adds Two Known Exploited Vulnerabilities to Catalog

CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-48939 iCagenda Unrestricted Upload of File with Dangerous Type Vulnerability CVE-2026-56291 Balbooa Forms Unrestricted Upload of...

Read full advisory

All CVSS Scores

CVSS v4.0 10.0 Critical

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

CVSS v3.1 9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

theendofabbys/CVE-2026-56291

github · Created 2026-10-08 03:31:32 UTC · 0 stars · AI assessment 90%

Balbooa Forms < 2.4.1 - Unauthenticated Arbitrary File Upload

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 21:12 UTC

    Indicators of compromise added (11)

    Indicators of compromise recorded

  2. 21:12 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

  3. 04:31 UTC

    Public PoC available

    Public proof-of-concept code published

  4. 04:31 UTC

    Nuclei template available

    Scanner coverage available

  5. 18:20 UTC

    KEV confirmed by All CISA Advisories

    Exploitation attested by an external source

  6. 17:51 UTC

    KEV confirmed by CVE

    Exploitation attested by an external source

  7. 17:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  8. 09:53 UTC

    CVE published

    Vulnerability disclosed publicly

  9. 11:57 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

Start 14-day Pro trial Read API docs
  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-56291

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-56291",
  "confidence": "Confirmed",
  "cvss_score": 10.0,
  "cvss_estimated": false,
  "epss_score": 0.14854,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 14, "sensors": 9 }
}