{"id":"GHSA-hxjg-93wc-h8p8","aliases":["GO-2026-6449"],"title":"Komari: Management Interface CSRF","summary":"Komari: Management Interface CSRF","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","vendor":"komari-monitor","product":"github.com/komari-monitor/komari","ecosystem":"go","affected":["github.com/komari-monitor/komari < 0.0.0-20260609084633-98122fa4d110"],"patched":["github.com/komari-monitor/komari 0.0.0-20260609084633-98122fa4d110"],"published":"2026-09-09","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:41:04.653498506Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-hxjg-93wc-h8p8","references":[{"url":"https://github.com/komari-monitor/komari/security/advisories/GHSA-hxjg-93wc-h8p8"},{"url":"https://github.com/komari-monitor/komari"},{"url":"https://github.com/komari-monitor/komari/releases/tag/1.2.2"},{"url":"https://github.com/advisories/GHSA-hxjg-93wc-h8p8"}],"tags":["osv","go","ghsa"],"cwe":["CWE-918"],"ingestedAt":"2026-09-10T00:26:24.579Z","slug":"GHSA-hxjg-93wc-h8p8","body":"## Overview\n\n# Vulnerability Overview\n\nThe `session_token` cookie is set **without** the `SameSite` or `Secure` attributes (`login.go:68`).\n\nAll `/api/admin/` management endpoints rely solely on this cookie for authentication, with **no CSRF token or Origin validation**.\n\n**The server-side vulnerability is confirmed to exist; however, exploitation via cross-site requests is mitigated in modern browsers by the default `SameSite=Lax` behavior.**\n\n## Root Cause\n\n```go\n// komari-main/api/public/login.go:68\nc.SetCookie(\"session_token\", session, 2592000, \"/\", \"\", false, true)\n// Secure=false, SameSite not explicitly set\n// Admin route group (server.go:213-343) has no CSRF middleware\n```\n\nGin's `ShouldBindJSON` does not strictly validate the `Content-Type` header, allowing `text/plain` requests to bypass CORS preflight.\n\n## Browser Limitations\n\n- Chrome 80+ (Feb 2020), Firefox 103+ (Jul 2022), and Safari all default unspecified cookies to `SameSite=Lax`.\n- Cookies without an explicit `SameSite` attribute **are not included in cross-site POST requests**.\n- As a result, the server receives requests without the session cookie and returns **HTTP 401 Unauthorized**.\n\n| Scenario | Exploitable |\n|----------|-------------|\n| Cross-site HTML (modern browsers) | ✗ Blocked by `SameSite=Lax` |\n| Cross-site HTML (Chrome <80 / legacy browsers) | ✓ |\n| Same-origin context (Browser Console / existing XSS) | ✓ |\n| Man-in-the-middle over HTTP (`Secure=false`) | ✓ |\n\n## High-Impact Operations Reachable via CSRF\n\n| Endpoint | Method | Impact |\n|----------|--------|--------|\n| `/api/admin/task/exec` | POST | Execute arbitrary shell commands on managed nodes |\n| `/api/admin/2fa/disable` | POST | Disable administrator two-factor authentication |\n| `/api/admin/settings/` | POST | Modify system configuration |\n| `/api/admin/upload/backup` | POST | Upload a malicious backup |\n| `/api/admin/record/clear/all` | POST | Delete all monitoring records |\n| `/api/admin/client/:uuid/edit` | POST | Modify client configuration |\n| `/api/admin/client/:uuid/remove` | POST | Remove managed clients |\n| `/api/admin/session/remove/all` | POST | Invalidate all active sessions |\n| `/api/admin/settings/cloudflared/start` | POST | Start a Cloudflared tunnel |\n\n## PoC 1 — Disable 2FA\n\n```html\n\n\nLoading...\n\n\n
\n\n\n\n```\n\n## PoC 2 — Remote Command Execution\n\n```html\n\n\nLoading...\n\n\n\n\n```\n\n## PoC 3 — Modify System Configuration\n\n```html\n\n\nLoading...\n\n\n\n\n```\n\n## PoC 4 — Clear All Monitoring Records\n\n```html\n\n\nLoading...\n\n\n
\n\n\n\n```\n\n## Verification Script\n\n```bash\n#!/bin/bash\nKOMARI=\"${1:-https://komari.example.com}\"\n\necho \"=== CSRF Verification ===\"\n\necho \"[1] Cookie Attributes...\"\ncurl -s -D - -o /dev/null \\\n -X POST \"$KOMARI/api/public/login\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"username\":\"test\",\"password\":\"test\"}' | grep -i 'set-cookie'\n\necho \"\"\necho \"[2] CORS Headers...\"\ncurl -s -D - -o /dev/null \\\n -H \"Origin: https://evil.com\" \\\n \"$KOMARI/api/public/config\" | grep -i 'access-control'\n\necho \"\"\necho \"[3] CSRF Protection on Admin Endpoint...\"\nCODE=$(curl -s -o /dev/null -w \"%{http_code}\" \\\n -X POST \"$KOMARI/api/admin/settings/\" \\\n -H \"Content-Type: application/json\" \\\n -H \"Origin: https://evil.com\" \\\n -d '{}')\n\necho \" HTTP ${CODE} — A 401 response indicates that only session authentication is enforced and no CSRF protection is present.\"\n```\n\n## Affected packages\n\n- `github.com/komari-monitor/komari < 0.0.0-20260609084633-98122fa4d110`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/komari-monitor/komari 0.0.0-20260609084633-98122fa4d110`","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}