CVE-2023-35885Known exploitationPublic exploitNetwork attack vector

Unauthenticated command execution via forged file-manager cookie

Published Jun 20, 2023 · Updated Dec 9, 2024

Authentication bypass in CloudPanel 2 before 2.3.1 allows remote attackers to access its file manager without valid credentials. The file-manager endpoint accepts an encrypted, serialized clp-fm cookie forged with a default secret key and treats its embedded user value as authenticated. Unauthenticated network access to the management interface is enough to create and edit a web-accessible PHP file, enabling arbitrary command execution under the service account.

CVSS severity9.8
Critical
EPSS probability74.89%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in CloudPanel 2 before 2.3.1 allows remote attackers to access its file manager without valid credentials. The file-manager endpoint accepts an encrypted, serialized clp-fm cookie forged with a default secret key and treats its embedded user value as authenticated. Unauthenticated network access to the management interface is enough to create and edit a web-accessible PHP file, enabling arbitrary command execution under the service account.

The record

CVE
CVE-2023-35885
Published
Jun 20, 2023
Updated
Dec 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-565, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 9, 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?

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

9.8CISA ADPCVSS: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.

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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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-565Reliance on Cookies without Validation and Integrity Checking
T1190Exploit Public-Facing Application

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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