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CVE-2025-50578VulnerabilityPublished

CVE-2025-50578: n/a

Source CVE Database V5

0

Not known to be exploited · public detection template (Nuclei) · CVSS 9.8 Critical.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
2.9% chance of exploitation in 30 days – higher than 87% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Jul 2025

  2. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  3. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  4. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

AI-suggested

To mitigate CVE-2025-50578, European organizations should immediately upgrade Heimdall to a patched version once available from LinuxServer.io. Until a patch is released, organizations should implement strict input validation and sanitization on HTTP headers at the web server or reverse proxy level, rejecting or normalizing suspicious 'X-Forwarded-Host' and 'Referer' headers. Employing web application firewalls (WAFs) with custom rules to detect and block anomalous header values can reduce exposure. Additionally, configuring Heimdall to avoid relying on untrusted headers for critical logic such as redirects or host resolution is essential. Organizations should audit their Heimdall deployment for any custom redirect or host-based logic and refactor it to use fixed, validated values. User awareness training focused on phishing risks related to open redirects can help mitigate social engineering attacks. Monitoring logs for unusual redirect patterns or header anomalies will aid in early detection of exploitation attempts. Finally, network segmentation and limiting Heimdall’s exposure to trusted users or internal networks can reduce the attack surface.

Description

LinuxServer.io heimdall 2.6.3-ls307 contains a vulnerability in how it handles user-supplied HTTP headers, specifically `X-Forwarded-Host` and `Referer`. An unauthenticated remote attacker can manipulate these headers to perform Host Header Injection and Open Redirect attacks. This allows the loading of external resources from attacker-controlled domains and unintended redirection of users, potentially enabling phishing, UI redress, and session theft. The vulnerability exists due to insufficient validation and trust of untrusted input, affecting the integrity and trustworthiness of the application.

References

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