CVE-2026-5259Public exploitNetwork attack vector

Authenticated SSRF via unchecked preview URL

Published Apr 1, 2026 · Updated Apr 1, 2026

Server-side request forgery in Autohome Frostmourne 1.0 allows remote authenticated users to request internal resources through Alarm Preview. The /alarm/previewData endpoint accepts a user-controlled HTTP or HTTPS URL without destination validation, issues the request from the server, and returns the response. An authenticated account with Alarm Preview access can read reachable internal or cloud-metadata responses and use response behavior to scan ports.

CVSS severity6.3
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Autohome Frostmourne 1.0 allows remote authenticated users to request internal resources through Alarm Preview. The /alarm/previewData endpoint accepts a user-controlled HTTP or HTTPS URL without destination validation, issues the request from the server, and returns the response. An authenticated account with Alarm Preview access can read reachable internal or cloud-metadata responses and use response behavior to scan ports.

The record

CVE
CVE-2026-5259
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
Autohome, Inc.
Product
Frostmourne
Classifications
CWE-918, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 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=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Autohome, Inc. · Frostmourneversion=1.0

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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