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CVE-2026-1357

CRITICAL 9.8 CVSS 3.1
Published
February 11, 2026
Last modified
June 17, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-434
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Affected WordPress components

  • WPvivid — Backup, Migration & Staging Plugin · wpvivid-backuprestore
    Confirmed match Active
    Up to and including 0.9.123
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • wpvividplugins WPvivid — Backup, Migration & Staging — Up to and including 0.9.123

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/tags/0.9.122/includes/class-wpvivid-crypt.php#L58
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/tags/0.9.122/includes/customclass/class-wpvivid-send-to-site.php#L629
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/tags/0.9.123/includes/class-wpvivid-crypt.php#L58
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/tags/0.9.123/includes/customclass/class-wpvivid-send-to-site.php#L629
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/trunk/includes/class-wpvivid-crypt.php#L58
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/trunk/includes/customclass/class-wpvivid-send-to-site.php#L629
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/3448386/wpvivid-backuprestore#file1
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/e5af0317-ef46-4744-9752-74ce228b5f37?source=cve
  • nvd.nist.gov Official NVD record