CVE-2026-1357

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 35.12%
EPSS Percentile: 98.41%
CISA KEV: Not listed

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: security@wordfence.com
Published: 11-Feb-2026 13:15
Last Modified: 17-Jun-2026 17:15
EPSS Date: 2026-10-12
CWE: CWE-434

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:H /
                            I:H /
                            A:H

References

Last enrichment sync: 13-Oct-2026 05:27
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

CVE-2026-1357 Recorded Future Identifies 85 High-Impact Vulnerabilities in July, Many Actively Exploited

CVE (80)

Malware (4)

Threat Actors (8)

Vendors (25)

Products (70)

Tools (1)

Countries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.