CVE-2023-39966Public exploitNetwork attack vector

Server takeover via unauthenticated arbitrary file write

Published Aug 10, 2023 · Updated Oct 4, 2024

Arbitrary file write in FIT2CLOUD 1Panel 1.4.3 allows remote attackers to overwrite server files through a crafted POST request. The SaveContent handler in backend/app/api/v1/file.go accepts an attacker-controlled path and content, then passes both to fileService.SaveContent without filtering the destination. No authentication is required; writing an SSH authorization file can grant remote control of the server.

CVSS severity7.5
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in FIT2CLOUD 1Panel 1.4.3 allows remote attackers to overwrite server files through a crafted POST request. The SaveContent handler in backend/app/api/v1/file.go accepts an attacker-controlled path and content, then passes both to fileService.SaveContent without filtering the destination. No authentication is required; writing an SSH authorization file can grant remote control of the server.

The record

CVE
CVE-2023-39966
Published
Aug 10, 2023
Updated
Oct 4, 2024
Vendor
FIT2CLOUD
Product
1Panel
Classifications
CWE-862, T1098.004, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2024Record 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== 1.4.3
  2. Affected versionversion=1.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FIT2CLOUD · 1Panelversion== 1.4.3; version=1.4.3

Published CVSS scores

7.5GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 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-862Missing Authorization
T1098.004SSH Authorized Keys
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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