CVE-2026-1357 PoC — Migration, Backup, Staging <= 0.9.123 - Unauthenticated Arbitrary File Upload

Title:Migration, Backup, Staging <= 0.9.123 - Unauthenticated Arbitrary File Upload (CVE-2026-1357)
Description:The Migration, Backup, Staging – WPvivid Backup & Migration plugin for WordPress is vulnerable to Unauthenticated Arbitrary File Upload in versions up to and including 0.9.123. This is due to improper error handling in the RSA decryption process combined with a lack of path sanitization when writing uploaded files. When the plugin fails to decrypt a session key using openssl_private_decrypt(), it does not terminate execution and instead passes the boolean false value to the phpseclib library's AES cipher initialization. The library treats this false value as a string of null bytes, allowing an attacker to encrypt a malicious payload using a predictable null-byte key. Additionally, the plugin accepts filenames from the decrypted payload without sanitization, enabling directory traversal to escape the protected backup directory. This makes it possible for unauthenticated attackers to upload arbitrary PHP files to publicly accessible directories and achieve Remote Code Execution via the wpvivid_action=send_to_site parameter.

WPvivid Backup & Migration plugin for WordPress <= 0.9.123 contains an unauthenticated arbitrary file upload vulnerability caused by improper error handling in RSA decryption and lack of path sanitization, letting unauthenticated attackers upload arbitrary PHP files and achieve remote code execution via wpvivid_action=send_to_site parameter.

 id: CVE-2026-1357

info:
  name: WPvivid Backup & Migration <= 0.9.123 - Arbitrary File Upload
  aut

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