CVEs / CVE-2026-1357

CVE-2026-1357: wpvividplugins WPvivid — Backup, Migration & Staging vulnerability

critical 9.8 CVSS 3.1 (from the CNA)
EPSS 39% chance of exploitation in the next 30 days, higher than 98% of CVEs (8 Nov 2026)
Last changed at its sources 17 Jun 2026

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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.
The CVE record, via NVD · published 11 Feb 2026 · NVD status: Deferred

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
wpvividplugins WPvivid — Backup, Migration & Staging	up to and including 0.9.123	—

Exploitation

Not in the CISA Known Exploited Vulnerabilities catalog as of 6 Nov 2026.

Severity

CVSS 3.1	9.8 critical `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Scored by the CNA ([email protected])
Weakness	CWE-434

References

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.