CVE-2026-27600Network attack vector

Internal service enumeration via unrestricted notifier URLs

Published Mar 3, 2026 · Updated Mar 3, 2026

Blind SSRF in HomeBox before 0.24.0-rc.1 allows remote authenticated users to enumerate internal services through notifier URLs. The notifier accepts a user-supplied host, IP address, and port without validation, then issues an HTTP POST from the server. Any authenticated account can use destination-dependent UI behavior as a side channel to distinguish reachable internal hosts and ports.

CVSS severity5.0
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Blind SSRF in HomeBox before 0.24.0-rc.1 allows remote authenticated users to enumerate internal services through notifier URLs. The notifier accepts a user-supplied host, IP address, and port without validation, then issues an HTTP POST from the server. Any authenticated account can use destination-dependent UI behavior as a side channel to distinguish reachable internal hosts and ports.

The record

CVE
CVE-2026-27600
Published
Mar 3, 2026
Updated
Mar 3, 2026
Vendor
SysAdmins Media
Product
HomeBox
Classifications
CWE-918, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 2026Record 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=< 0.24.0-rc.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SysAdmins Media · HomeBoxversion=< 0.24.0-rc.1

Published CVSS scores

5.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

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

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Your stack

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