| Thành phần | Giá trị | Ý nghĩa |
|------------|---------|---------|
| AV (Attack Vector) | **Network (N)** | Remote exploitation over network |
| AC (Attack Complexity) | **Low (L)** | No special conditions required |
| AT (Attack Requirements) | **None (N)** | No prerequisites required |
| PR (Privileges Required) | **Low (L)** | Only a user with write privileges needed |
| UI (User Interaction) | **None (N)** | No victim interaction required |
| VC/VI/VA (Vulnerable System) | **High / High / High** | Entire CIA triad affected |
| SC/SI/SA (Subsequent System) | **None** | No impact on other systems |

---

## Remediation Guide

### 1. Primary measure: Upgrade MongoDB Server

This is the **only and thorough** measure. Upgrade MongoDB Server to the corresponding patched version:```bash
# Kiểm tra phiên bản hiện tại
mongod --version

# Debian/Ubuntu — nâng cấp qua APT
sudo apt update
sudo apt install -y mongodb-org=<phiên-bản-đã-vá>

# RHEL/CentOS/Rocky — nâng cấp qua YUM/DNF
sudo yum update mongodb-org-<phiên-bản-đã-vá>

# Docker — pull image mới
docker pull mongo:<phiên-bản-đã-vá>

---

## Scanning Tool: `CVE-2026-8053-MongoDB-Fixed.sh`

Bash script that automatically scans and assesses whether a MongoDB Server is affected by CVE-2026-8053. The script is designed to run safely on **production** — all operations are **read-only**, no data is written to MongoDB.

### Key Features

| Feature | Description |
|---------|-------------|
| Installation detection | Automatically finds `mongod` binary path and shell (`mongosh`/`mongo`) |
| Version comparison | Checks installed version against the affected list (6 branches) |
| EOL detection | Alerts if MongoDB belongs to an end‑of‑life branch (4.4 and below) |
| Time‑series scan | Lists all time‑series collections across the entire cluster |
| Permission check | Lists users with write permissions — potential vulnerability exploit targets |
| Security check | Assesses `authorization`, `bindIp`, `TLS/SSL` configuration |
| Replica set support | Connects via connection string `mongodb://host:port/?replicaSet=name` |
| Multiple output modes | Normal (color), quiet (exit code), JSON (CI/CD) |
| Absolute safety | **0 write operations** — all MongoDB commands are read‑only |

### System Requirements

| Requirement | Detail |
|-------------|--------|
| Operating System | Linux (Ubuntu, Debian, RHEL, CentOS, Rocky, Alma, etc.) |
| Bash | ≥ 4.0 (supports associative arrays) |
| MongoDB Shell | `mongosh` (recommended) or `mongo` (legacy) |
| OS privileges | `sudo` / `root` (to read config file `/etc/mongod.conf`) |
| MongoDB privileges | User with read access to `system.users` and ability to run `listDatabases` |

### Command‑Line Options (CLI)

| Short Option | Long Option | Argument | Default | Description |
|--------------|-------------|----------|---------|-------------|
| `-h` | `--help` | — | — | Display help and exit |
| `-q` | `--quiet` | — | `false` | Output only essential results, use exit code to determine status |
| `-j` | `--json` | — | `false` | Output results as JSON (suitable for CI/CD pipelines) |
| `-H` | `--host` | `HOST` | `localhost` | MongoDB server address |
| `-P` | `--port` | `PORT` | `27017` | MongoDB port |
| `-u` | `--user` | `USER` | `super_admin` | MongoDB login name |
| `-p` | `--pass` | `PASS` | *(internal default value)* | MongoDB password |
| `-r` | `--replica-set` | `NAME` | `rs_cams` | Replica set name (if applicable) |
| — | `--auth-db` | `DB` | `admin` | Authentication database |
| — | `--no-color` | — | `false` | Disable ANSI color in output |

### 6‑Step Scanning Process

The script executes 6 sequential steps. Each step logs status with `[INFO]` / `[OK]` / `[WARN]` / `[ERROR]`.```
Bước 1: Phát hiện MongoDB installation
  ├─ Tìm mongod trong $PATH
  ├─ Duyệt các thư mục phổ biến:
  │   /usr/bin, /usr/local/bin, /opt/mongodb/bin, /usr/lib/mongodb, /snap/bin
  └─ Thất bại → exit 0 (không cài đặt = không bị ảnh hưởng)

Bước 2: Lấy phiên bản MongoDB
  ├─ Chạy: mongod --version
  ├─ Parse output: "db version v6.0.15" → "6.0.15"
  └─ Thất bại → exit 2 (lỗi không xác định)

Bước 3: So sánh phiên bản với danh sách bị ảnh hưởng
  ├─ Tách major.minor.patch bằng regex
  ├─ Kiểm tra EOL (4.4, 4.2, 4.0, 3.6, ...)
  ├─ Đối chiếu với bảng PATCHED_VERSIONS:
  │   ┌────────────┬──────────────┬────────┐
  │   │ Nhánh      │ Ngưỡng vá    │ Ví dụ  │
  │   ├────────────┼──────────────┼────────┤
  │   │ 5.0        │ patch ≥ 33   │ 5.0.33 │
  │   │ 6.0        │ patch ≥ 28   │ 6.0.28 │
  │   │ 7.0        │ patch ≥ 34   │ 7.0.34 │
  │   │ 8.0        │ patch ≥ 23   │ 8.0.23 │
  │   │ 8.2        │ patch ≥ 9    │ 8.2.9  │
  │   │ 8.3        │ patch ≥ 2    │ 8.3.2  │
  │   └────────────┴──────────────┴────────┘
  ├─ Nhánh ≥ 8.4 → mặc định AN TOÀN
  └─ Kết quả: SAFE | VULNERABLE | EOL | UNKNOWN

Bước 4: Kiểm tra trạng thái mongod
  ├─ pgrep -x mongod
  ├─ systemctl is-active mongod
  ├─ ss / netstat kiểm tra port đang listen
  └─ Kết quả: đang chạy / không chạy

Bước 5: Kiểm tra time-series collections & quyền người dùng
  │ (chỉ thực hiện nếu mongod đang chạy và kết nối được)
  ├─ check_timeseries_collections():
  │   ├─ listDatabases → lấy danh sách tất cả database
  │   ├─ getCollectionInfos({ type: "timeseries" }) → từng database
  │   └─ Output: JSON array [{ database, collection, timeseries }]
  │
  ├─ check_user_privileges():
  │   ├─ Đọc admin.system.users
  │   ├─ Lọc user có role ghi: readWrite, dbOwner, root,
  │   │   readWriteAnyDatabase, dbAdmin, userAdmin, backup,
  │   │   restore, clusterAdmin, hostManager, __system
  │   ├─ Output: JSON array [{ user, database, roles }]
  │   └─ Đây là những user CÓ THỂ khai thác lỗ hổng
  │
  └─ Kết nối thất bại → gợi ý dùng -u -p để xác thực

Bước 6: Kiểm tra cấu hình bảo mật
  ├─ Tìm file mongod.conf (/etc/mongod.conf, /etc/mongodb.conf, ...)
  ├─ Fallback: đọc /proc/<pid>/cmdline nếu không tìm thấy file
  ├─ Kiểm tra 3 hạng mục:
  │   ├─ authorization: enabled  → [OK] / [WARN]
  │   ├─ bindIp: 127.0.0.1       → [OK] / [WARN] (public)
  │   └─ TLS/SSL: requireTLS     → [OK] / [WARN]
  └─ Kết quả: "OK" hoặc danh sách vấn đề (authorization_disabled, ...)

Full output with ANSI colors: banner, step-by-step log, summary table, detailed recommendations.```
==============================================
  CVE-2026-8053 Scanner v1.0.0
  CVE-2026-8053: FlatBSON Duplicate Field Index Drift
  Ngay quet: 2026-05-18 14:30:00
==============================================

[INFO] Buoc 1/6: Phat hien MongoDB installation...
[OK] Tim thay mongod tai: /usr/bin/mongod
[INFO] Buoc 2/6: Kiem tra phien ban MongoDB...
[INFO] Phien ban cai dat: 7.0.32
[INFO] Buoc 3/6: So sanh voi danh sach phien ban bi anh huong...
[ERROR] MongoDB 7.0.32 BI ANH HUONG boi CVE-2026-8053 — CAN NANG CAP NGAY!
...

==============================================
  KET QUA QUET
==============================================

  Phien ban MongoDB       : 7.0.32
  mongod dang chay        : Co
  Replica Set             : rs_cams
  Trang thai CVE-2026-8053: NGUY HIEM — CO LO HONG

==============================================
  KHUYEN NGHI
==============================================

  [!!!] HANH DONG KHAN CAP:
  1. Nang cap MongoDB Server NGAY LAP TUC len phien ban da va:
     -> Nang cap len 7.0.34 hoac moi hon
  ...

Only show `[ERROR]` / `[WARN]` / `[OK]` lines — suitable for quick checks. Only rely on **exit code**:

| Exit Code | Meaning | Action |
|-----------|---------|--------|
| `0` | **SAFE** — MongoDB is patched | No action needed |
| `1` | **VULNERABLE** — Vulnerability exists | Upgrade immediately |
| `2` | **EOL / ERROR** — End-of-life version or detection error | Urgent upgrade |

#### 3. JSON mode (`-j`)```bash
sudo bash CVE-2026-8053-MongoDB-Fixed.sh -j -q

### Safety Assurance — Read-Only

The script **does not perform any write operations** on the MongoDB cluster. All MongoDB commands used:

| Command | Purpose | Type |
|---------|---------|------|
| `db.version()` | Check connection + runtime version | **Read** |
| `adminCommand({ listDatabases: 1, nameOnly: true })` | List database names | **Read** (Admin Command) |
| `db.getCollectionInfos({ type: "timeseries" })` | Get collection metadata | **Read** |
| `admin.system.users.find({})` | Read user & role list | **Read** (System Collection) |

There are no `insert`, `update`, `delete`, `createCollection`, `drop`, `grantRolesToUser`, `replSetReconfig`, or any write commands. **The script is safe to run on a production cluster.**

### Usage Example```bash
# 1. Quét cơ bản trên localhost (yêu cầu sudo để đọc /etc/mongod.conf)
sudo bash CVE-2026-8053-MongoDB-Fixed.sh

# 2. Quét với thông tin xác thực tùy chỉnh
sudo bash CVE-2026-8053-MongoDB-Fixed.sh \
  -H 10.0.0.5 -P 27017 \
  -u myadmin -p 'MyStr0ngP@ss'

# 3. Quét replica set với auth
sudo bash CVE-2026-8053-MongoDB-Fixed.sh \
  -H 10.0.0.5 -P 27017 \
  -u app_user -p 'pass123' \
  -r rs_production

# 4. Chỉ lấy exit code, không hiển thị log (dùng trong script)
sudo bash CVE-2026-8053-MongoDB-Fixed.sh -q
if [ $? -eq 0 ]; then
    echo "MongoDB an toan"
else
    echo "CAN NANG CAP MongoDB NGAY!"
fi

# 5. Output JSON cho CI/CD pipeline
sudo bash CVE-2026-8053-MongoDB-Fixed.sh -q -j > scan_result.json

# 6. Dùng jq để trích xuất thông tin từ JSON
sudo bash CVE-2026-8053-MongoDB-Fixed.sh -q -j | jq -r '.mongodb.status'
sudo bash CVE-2026-8053-MongoDB-Fixed.sh -q -j | jq '.risky_users | length'

# 7. Tích hợp vào cron job (quét hàng ngày lúc 7h sáng)
# Thêm vào /etc/cron.d/mongodb-cve-scan:
# 0 7 * * * root /opt/scripts/CVE-2026-8053-MongoDB-Fixed.sh -q -j | \
#   tee /var/log/mongodb-cve-scan/$(date +\%Y\%m\%d).json

---

## Real-world Impact

| Aspect | Assessment |
|--------|------------|
| **Exploit availability** | No public PoC available (at the time of disclosure) |
| **Exploit difficulty** | Medium — requires deep understanding of FlatBSON internals |
| **Impact scope** | All MongoDB servers with time-series collections deployed |
| **High-risk targets** | Systems allowing multiple users with write permissions, MongoDB exposed to the Internet |

---

## Timeline

| Date | Event |
|------|-------|
| 06/05/2026 | CVE reserved |
| 12/05/2026 | MongoDB publishes advisory and releases patch |
| 12/05/2026 | GitHub Advisory (GHSA-pr63-cc36-q84h) published |
| 13/05/2026 | Updates on NVD, Tenable, Snyk, Debian Security Tracker |

---

## References

- [MongoDB Jira — SERVER-126021](https://jira.mongodb.org/browse/SERVER-126021)
- [NVD — CVE-2026-8053](https://nvd.nist.gov/vuln/detail/CVE-2026-8053)
- [GitHub Advisory — GHSA-pr63-cc36-q84h](https://github.com/advisories/ghsa-pr63-cc36-q84h)
- [MongoDB Community Forum — Important patch May 2026](https://www.mongodb.com/community/forums/t/important-mongodb-patch-available-may-2026/339172)
- [Tenable — CVE-2026-8053](https://www.tenable.com/cve/CVE-2026-8053)
- [Snyk — SNYK-UNMANAGED-MONGODB-16678063](https://security.snyk.io/vuln/SNYK-UNMANAGED-MONGODB-16678063)
- [Debian Security Tracker — CVE-2026-8053](https://security-tracker.debian.org/tracker/CVE-2026-8053)
- [Cyber Security News — Critical MongoDB RCE](https://cybersecuritynews.com/mongodb-rce-vulnerability/)