# CVE-2026-1357: WPvivid — Backup, Migration & Staging - Arbitrary File Upload

> Live exploitation tracking for CVE-2026-1357 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2026-1357

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.8
- **Public exploit available:** Yes
- **Affected products:** Wpvividplugins WPvivid — Backup, Migration & Staging
- **Weaknesses:** CWE-434 (Unrestricted Upload of File with Dangerous Type)
- **Tags:** wordpress, cms

## 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.

## CrowdSec analysis

[CVE-2026-1357](https://euvd.enisa.europa.eu/vulnerability/CVE-2026-1357) is a critical vulnerability in the WPvivid Backup & Migration plugin for WordPress that allows unauthenticated attackers to upload arbitrary files due to improper error handling and lack of path sanitization. Exploiting this flaw, attackers can upload malicious PHP files outside the intended backup directory, leading to remote code execution on the affected WordPress site. This vulnerability poses a severe risk, as it enables full compromise of the website without requiring authentication.

CrowdSec has been tracking this vulnerability and its exploits since 15th of April 2026.

CrowdSec has not observed any significant exploitation activity targeting CVE-2026-1357 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.

Attackers exploit the WPvivid Backup & Migration plugin by sending POST requests with the parameter `wpvivid_action=send_to_site` to upload arbitrary files, often targeting the WordPress root endpoint and resulting in malicious files being placed under `/wp-content/uploads/`.

## Timeline

- 2026-02-11: CVE Published. CVE-2026-1357 is published to NVD.
- 2026-04-15: Rule Released. CrowdSec releases a rule to detect CVE-2026-1357 exploitation attempts against the CrowdSec Network.

## References

- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-1357.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2026-1357) follows observed exploitation activity for CVE-2026-1357. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.