CVE-2025-55912Public exploitNetwork attack vector

Unauthenticated arbitrary file upload via missing access controls

Published Sep 18, 2025 · Updated Sep 18, 2025

Unrestricted file upload in ClipBucket 5.5.0 and earlier allows remote attackers to upload arbitrary files through the Plupload endpoint. The plupload branch in upload/actions/photo_uploader.php performs no authentication check before writing uploaded content into the dated photos directory. No account or user interaction is required; code execution additionally requires bypassing the file checks and a web server that executes the stored PHP file.

CVSS severity7.3
High
EPSS probability1.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in ClipBucket 5.5.0 and earlier allows remote attackers to upload arbitrary files through the Plupload endpoint. The plupload branch in upload/actions/photo_uploader.php performs no authentication check before writing uploaded content into the dated photos directory. No account or user interaction is required; code execution additionally requires bypassing the file checks and a web server that executes the stored PHP file.

The record

CVE
CVE-2025-55912
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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

Technologies

Your stack

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Your stack

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