CVE-2026-1357 Migration, Backup, Staging <= 0.9.123 - Unauthenticated Arbitrary File Upload
Unauthenticated attackers can upload arbitrary PHP files to achieve remote code execution due to improper error handling and lack of path sanitization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-1357?
CVE-2026-1357 is a critical vulnerability in wpvividplugins WPvivid — Backup, Migration & Staging, published on 11 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-434
Which versions are affected by CVE-2026-1357?
How do I fix CVE-2026-1357?
No fix has been published for CVE-2026-1357 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-1357 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1357 exists.
Public exploit code: 1 Nuclei template and 11 proofs of concept on GitHub.
Sources
Also known as GHSA-3cvp-fw5m-7w6r.