{"id":59908,"date":"2025-08-06T01:04:14","date_gmt":"2025-08-06T01:04:14","guid":{"rendered":""},"modified":"2025-08-08T17:03:16","modified_gmt":"2025-08-08T23:03:16","slug":"cve-2025-50578-critical-host-header-injection-and-open-redirect-vulnerability-in-linuxserver-io-heimdall","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-50578-critical-host-header-injection-and-open-redirect-vulnerability-in-linuxserver-io-heimdall\/","title":{"rendered":"<strong>CVE-2025-50578: Critical Host Header Injection and Open Redirect Vulnerability in LinuxServer.io Heimdall<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A critical vulnerability has surfaced in LinuxServer.io heimdall version 2.6.3-ls307, which has potentially severe implications for the integrity and trustworthiness of the affected applications. The vulnerability, coined as CVE-2025-50578, is significant due to how it handles user-supplied HTTP headers. Specifically, it concerns the `X-Forwarded-Host` and `Referer` headers.<br \/>\nThis <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52808-a-critical-php-remote-file-inclusion-vulnerability-in-realtyelite\/\"  data-wpil-monitor-id=\"65912\">vulnerability has been found exploitable by unauthenticated remote<\/a> attackers who can manipulate these headers to perform Host Header Injection and Open Redirect attacks. These <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7766-xml-external-entity-attack-on-lantronix-provisioning-manager\/\"  data-wpil-monitor-id=\"68277\">attacks may result in loading of external<\/a> resources from attacker-controlled domains and unintended redirection of users, enabling phishing, UI redress, and session theft.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-50578<br \/>\nSeverity: Critical (CVSS: 9.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45346-sql-injection-vulnerability-in-bacula-web-resulting-in-potential-system-compromise\/\"  data-wpil-monitor-id=\"68079\">Potential system<\/a> compromise, data leakage, and unintended user redirection<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3719512192\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p>LinuxServer.io Heimdall | 2.6.3-ls307<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40737-critical-file-path-validation-vulnerability-in-sinec-nms\/\"  data-wpil-monitor-id=\"66623\">vulnerability exists due to insufficient validation<\/a> and trust of untrusted input, particularly HTTP headers such as `X-Forwarded-Host` and `Referer`. These headers can be manipulated by an unauthenticated <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-33054-insufficient-ui-warning-in-remote-desktop-client-opens-door-to-spoofing-attacks\/\"  data-wpil-monitor-id=\"68078\">remote attacker to perform Host Header Injection and Open<\/a> Redirect attacks.<br \/>\nHost Header Injection <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50105-critical-vulnerability-in-oracle-universal-work-queue-allowing-unauthorized-data-access\/\"  data-wpil-monitor-id=\"68661\">allows an attacker to control the data<\/a> that is returned to the user, potentially leading to a phishing attack. <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6238-open-redirect-vulnerability-in-ai-engine-wordpress-plugin\/\"  data-wpil-monitor-id=\"71103\">Open Redirect<\/a>, on the other hand, could lead to the redirection of users to unintended, potentially malicious websites, thus enabling further attacks like phishing and session theft.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3011728423\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>The following conceptual <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8243-critical-buffer-overflow-vulnerability-in-totolink-x15-http-post-request-handler\/\"  data-wpil-monitor-id=\"67133\">HTTP request demonstrates how an attacker might exploit this vulnerability<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">GET \/ HTTP\/1.1\nHost: legitimatesite.com\nX-Forwarded-Host: malicious.com\nReferer: legitimatesite.com<\/code><\/pre>\n<p>In this example, the attacker manipulates the `X-Forwarded-Host` and `Referer` headers to point to a malicious domain, which could then serve inappropriate content or even capture <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43233-critical-https-proxy-vulnerability-allowing-sensitive-data-access\/\"  data-wpil-monitor-id=\"69322\">sensitive user data<\/a>.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>The best mitigation for this vulnerability is to apply the vendor patch as soon as it becomes available. In the absence of a patch, or until one can be applied, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation. These tools can be configured to block or alert on attempts to exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53964-critical-file-manipulation-vulnerability-in-goldendict\/\"  data-wpil-monitor-id=\"67132\">vulnerability by monitoring for suspicious manipulation<\/a> of HTTP headers.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A critical vulnerability has surfaced in LinuxServer.io heimdall version 2.6.3-ls307, which has potentially severe implications for the integrity and trustworthiness of the affected applications. The vulnerability, coined as CVE-2025-50578, is significant due to how it handles user-supplied HTTP headers. Specifically, it concerns the `X-Forwarded-Host` and `Referer` headers. This vulnerability has been found exploitable by [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-59908","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59908","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=59908"}],"version-history":[{"count":8,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59908\/revisions"}],"predecessor-version":[{"id":63638,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59908\/revisions\/63638"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=59908"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=59908"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=59908"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=59908"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=59908"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=59908"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=59908"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=59908"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=59908"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}