Migration, Backup, Staging Plugin up to 0.9.123 on WordPress openssl_private_decrypt path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in Migration, Backup, Staging Plugin up to 0.9.123 on WordPress. This impacts the function openssl_private_decrypt. This manipulation causes path traversal. The identification of this vulnerability is CVE-2026-1357. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Migration, Backup, Staging Plugin up to 0.9.123 on WordPress. It has been declared as critical. Affected by this vulnerability is the function openssl_private_decrypt. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-1357. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/12/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-202602-2037). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Backup Software

Name

• Migration, Backup, Staging Plugin

Version

• 0.9.123

CPE 2.3info

• 🔒

CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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