$ cve CVE-2026-1357 JSON

CVE-2026-1357

9.8

CRITICAL · CVSS 3.1 · EPSS 33.3% (pctl 98)

Patch early

EPSS 33.3% — above the 10% action threshold.

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.

Scoring

CVSS	9.8 (CRITICAL, v3.1)
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS	33.33% — more likely to be exploited than 98% of all CVEs
Weakness	CWE-434
On CISA KEV	no
Public exploit	none known
Published	2026-02-11
Last modified	2026-06-17

References

→ the Explorer · watch your stack · NVD