CVE-2025-50578Public exploitNetwork attack vector

Unauthenticated redirects via trusted request headers

Published Jul 30, 2025 · Updated Jul 30, 2025

Host header injection in LinuxServer.io Heimdall 2.6.3-ls307 allows remote attackers to load external resources and redirect users. The home endpoint prioritizes X-Forwarded-Host over Host when building asset URLs, while POST /users/{id} reflects Referer into Location without same-origin validation. The home-page behavior requires no authentication; the Referer redirect was demonstrated during a regular-user profile update and can send users to an attacker-controlled domain.

CVSS severity9.8
Critical
EPSS probability2.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Host header injection in LinuxServer.io Heimdall 2.6.3-ls307 allows remote attackers to load external resources and redirect users. The home endpoint prioritizes X-Forwarded-Host over Host when building asset URLs, while POST /users/{id} reflects Referer into Location without same-origin validation. The home-page behavior requires no authentication; the Referer redirect was demonstrated during a regular-user profile update and can send users to an attacker-controlled domain.

The record

CVE
CVE-2025-50578
Published
Jul 30, 2025
Updated
Jul 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-601, CWE-20, CWE-74
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2025Record 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 exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
CWE-20Improper Input Validation
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

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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