CVE-2025-50578CRITICAL 9.8EPSS p83.3%
CVE-2025-50578CVE-2025-50578
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.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 2.59% probability of exploitation · percentile 83.3% · 2026-06-18T12:00:27Z |
| Published | 2025-07-30 |
| Last modified | 2025-08-25 |
Underlying weaknesses· 3
References
3
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Improper Input Validationcwe-20 | 0% | live |
| Weakness | URL Redirection to Untrusted Site ('Open Redirect')cwe-601 | 0% | live |
| Weakness | Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')cwe-74 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.