---
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'
---
## Overview
# Vulnerability Overview
The `session_token` cookie is set **without** the `SameSite` or `Secure` attributes (`login.go:68`).
All `/api/admin/` management endpoints rely solely on this cookie for authentication, with **no CSRF token or Origin validation**.
**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.**
## Root Cause
```go
// komari-main/api/public/login.go:68
c.SetCookie("session_token", session, 2592000, "/", "", false, true)
// Secure=false, SameSite not explicitly set
// Admin route group (server.go:213-343) has no CSRF middleware
```
Gin's `ShouldBindJSON` does not strictly validate the `Content-Type` header, allowing `text/plain` requests to bypass CORS preflight.
## Browser Limitations
- Chrome 80+ (Feb 2020), Firefox 103+ (Jul 2022), and Safari all default unspecified cookies to `SameSite=Lax`.
- Cookies without an explicit `SameSite` attribute **are not included in cross-site POST requests**.
- As a result, the server receives requests without the session cookie and returns **HTTP 401 Unauthorized**.
| Scenario | Exploitable |
|----------|-------------|
| Cross-site HTML (modern browsers) | ✗ Blocked by `SameSite=Lax` |
| Cross-site HTML (Chrome <80 / legacy browsers) | ✓ |
| Same-origin context (Browser Console / existing XSS) | ✓ |
| Man-in-the-middle over HTTP (`Secure=false`) | ✓ |
## High-Impact Operations Reachable via CSRF
| Endpoint | Method | Impact |
|----------|--------|--------|
| `/api/admin/task/exec` | POST | Execute arbitrary shell commands on managed nodes |
| `/api/admin/2fa/disable` | POST | Disable administrator two-factor authentication |
| `/api/admin/settings/` | POST | Modify system configuration |
| `/api/admin/upload/backup` | POST | Upload a malicious backup |
| `/api/admin/record/clear/all` | POST | Delete all monitoring records |
| `/api/admin/client/:uuid/edit` | POST | Modify client configuration |
| `/api/admin/client/:uuid/remove` | POST | Remove managed clients |
| `/api/admin/session/remove/all` | POST | Invalidate all active sessions |
| `/api/admin/settings/cloudflared/start` | POST | Start a Cloudflared tunnel |
## PoC 1 — Disable 2FA
```html
Loading...
```
## PoC 2 — Remote Command Execution
```html
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```
## PoC 3 — Modify System Configuration
```html
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```
## PoC 4 — Clear All Monitoring Records
```html
Loading...
```
## Verification Script
```bash
#!/bin/bash
KOMARI="${1:-https://komari.example.com}"
echo "=== CSRF Verification ==="
echo "[1] Cookie Attributes..."
curl -s -D - -o /dev/null \
-X POST "$KOMARI/api/public/login" \
-H "Content-Type: application/json" \
-d '{"username":"test","password":"test"}' | grep -i 'set-cookie'
echo ""
echo "[2] CORS Headers..."
curl -s -D - -o /dev/null \
-H "Origin: https://evil.com" \
"$KOMARI/api/public/config" | grep -i 'access-control'
echo ""
echo "[3] CSRF Protection on Admin Endpoint..."
CODE=$(curl -s -o /dev/null -w "%{http_code}" \
-X POST "$KOMARI/api/admin/settings/" \
-H "Content-Type: application/json" \
-H "Origin: https://evil.com" \
-d '{}')
echo " HTTP ${CODE} — A 401 response indicates that only session authentication is enforced and no CSRF protection is present."
```
## Affected packages
- `github.com/komari-monitor/komari < 0.0.0-20260609084633-98122fa4d110`
## Remediation
Upgrade to a patched release:
- `github.com/komari-monitor/komari 0.0.0-20260609084633-98122fa4d110`