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

In plain English

A critical-severity unrestricted file upload in WPvivid — Backup, Migration & Staging from wpvividplugins. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 35.1% (higher than 98% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code.

Official 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.

Vendor	Product	Versions
wpvividplugins	WPvivid — Backup, Migration & Staging	0 – through 0.9.123

Vendor

Product

Versions

wpvividplugins

WPvivid — Backup, Migration & Staging

0 – through 0.9.123

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

In plain English

Official description

Affected products (as reported)

References