CVE-2026-75339Network attack vector

Arbitrary file upload via missing permission checks

Published Aug 27, 2026 · Updated Aug 27, 2026

Improper authorization in cjbi admin3 3.0.0 allows remote authenticated users to upload arbitrary files through /storage/upload. The storage upload handler accepts and stores user-supplied files without enforcing an endpoint permission check, while stored objects are exposed for unauthenticated download. A valid account is required to place content, but remote attackers who obtain an uploaded object's location can retrieve it without authentication.

CVSS severityUnavailable
Unscored
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper authorization in cjbi admin3 3.0.0 allows remote authenticated users to upload arbitrary files through /storage/upload. The storage upload handler accepts and stores user-supplied files without enforcing an endpoint permission check, while stored objects are exposed for unauthenticated download. A valid account is required to place content, but remote attackers who obtain an uploaded object's location can retrieve it without authentication.

The record

CVE
CVE-2026-75339
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo