CVE-2026-87820Network attack vector

Unauthenticated metadata disclosure via debugging endpoints

Published Sep 9, 2026 · Updated Sep 9, 2026

Information disclosure in CyberPanel 2.4.3 through 2.4.5 allows remote attackers to read metadata via AI Scanner debugging endpoints. The production API registers list-api-keys and test-auth debugging handlers without authentication, returning administrator usernames, API-key prefixes, scan IDs, domains, and ownership data. No credentials or user interaction are required; complete API keys are not disclosed, and the direct impact is limited to multi-tenant inventory and follow-on targeting.

CVSS severity6.9
Medium
EPSS probability0.52%
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

Information disclosure in CyberPanel 2.4.3 through 2.4.5 allows remote attackers to read metadata via AI Scanner debugging endpoints. The production API registers list-api-keys and test-auth debugging handlers without authentication, returning administrator usernames, API-key prefixes, scan IDs, domains, and ownership data. No credentials or user interaction are required; complete API keys are not disclosed, and the direct impact is limited to multi-tenant inventory and follow-on targeting.

The record

CVE
CVE-2026-87820
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
CyberPanel
Product
CyberPanel
Classifications
CWE-489, CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.4.3 <2.4.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CyberPanel · CyberPanelversion=2.4.3 <2.4.6

Published CVSS scores

5.3CyberPanel GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-489Active Debug Code
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
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