CVE-2025-55911Public exploitNetwork attack vector

Authenticated internal service access via unrestricted downloader URL

Published Sep 18, 2025 · Updated Sep 18, 2025

SSRF in ClipBucket 5.5.2 Build #90 allows remote authenticated users to make the server request attacker-selected URLs. In upload/actions/file_downloader.php, the file parameter reaches the remote-resource fetch path without restrictions on schemes, destination hosts, or private and link-local address ranges. A valid low-privilege session is required; resulting requests expose internal services and can disclose data returned by reachable metadata endpoints.

CVSS severity6.5
Medium
EPSS probability1.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in ClipBucket 5.5.2 Build #90 allows remote authenticated users to make the server request attacker-selected URLs. In upload/actions/file_downloader.php, the file parameter reaches the remote-resource fetch path without restrictions on schemes, destination hosts, or private and link-local address ranges. A valid low-privilege session is required; resulting requests expose internal services and can disclose data returned by reachable metadata endpoints.

The record

CVE
CVE-2025-55911
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1190
Attack vector
network
Privileges
authenticated

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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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 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 exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
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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