CVE-2026-65885Known exploitationNetwork attack vector

Authenticated code execution via unrestricted file upload

Published Jul 29, 2026 · Updated Jul 29, 2026

Unrestricted file upload in Balbooa Gridbox 1.0.0 through 2.20.1 allows remote authenticated users to upload arbitrary files. The Gridbox file upload methods accept dangerous file types without an extension restriction, and the public advisory withholds endpoint and parameter details. A high-privilege Gridbox account is required, but the separate registration flaw can supply it; uploaded executable content can run as the web server.

CVSS severity8.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Balbooa Gridbox 1.0.0 through 2.20.1 allows remote authenticated users to upload arbitrary files. The Gridbox file upload methods accept dangerous file types without an extension restriction, and the public advisory withholds endpoint and parameter details. A high-privilege Gridbox account is required, but the separate registration flaw can supply it; uploaded executable content can run as the web server.

The record

CVE
CVE-2026-65885
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
Balbooa
Product
Gridbox
Classifications
CWE-434, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0-2.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Balbooa · Gridboxversion=1.0.0-2.20.1

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.4Joomla! ProjectCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Reported exploitation

Technologies

Your stack

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Your stack

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