vulnerability WordPress Plugin: wpvivid-backuprestore: CVE-2026-1357: Unrestricted Upload of File with Dangerous Type Try Surface Command Back to search Severity CVSS Published Added Modified 10 (AV:N/AC:L/Au:N/C:C/I:C/A:C) Feb 10, 2026 Feb 11, 2026 Feb 12, 2026 Severity 10 CVSS (AV:N/AC:L/Au:N/C:C/I:C/A:C) Published Feb 10, 2026 Added Feb 11, 2026 Modified Feb 12, 2026 Description The Migration, Backup, Staging – WPvivid Backup and 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_actionequal tosend_to_site parameter. Solution wpvivid-backuprestore-plugin-cve-2026-1357 References URL-https://www.cve.org/CVERecord?id=CVE-2026-1357 URL-https://www.wordfence.com/threat-intel/vulnerabilities/id/e5af0317-ef46-4744-9752-74ce228b5f37?source=api-prod CVE-2026-1357 https://attackerkb.com/topics/CVE-2026-1357 CWE-434 NEW Explore Exposure Command Confidently identify and prioritize exposures from endpoint to cloud with full attack surface visibility and threat-aware risk context.