Unauthenticated code execution via null-key file upload
Published Feb 11, 2026 · Updated Feb 11, 2026
Arbitrary file upload in WPvivid Backup & Migration 0.9.123 and earlier allows remote attackers to execute PHP code on the server. The send_to_site path continues after RSA session-key decryption fails, initializes Rijndael with a predictable null-byte key, and writes an unsanitized payload filename outside the backup directory. Exploitation requires the disabled-by-default site-transfer key to be generated and unexpired, after which uploaded PHP runs with the web server's privileges.
Summary
What happened
Arbitrary file upload in WPvivid Backup & Migration 0.9.123 and earlier allows remote attackers to execute PHP code on the server. The send_to_site path continues after RSA session-key decryption fails, initializes Rijndael with a predictable null-byte key, and writes an unsanitized payload filename outside the backup directory. Exploitation requires the disabled-by-default site-transfer key to be generated and unexpired, after which uploaded PHP runs with the web server's privileges.
The record
- CVE
- CVE-2026-1357
- Published
- Feb 11, 2026
- Updated
- Feb 11, 2026
- Vendor
- WPvivid Plugins
- Product
- WPvivid Backup & Migration
- Classifications
- CWE-434, T1190, T1505.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 11, 2026CVE publishedPublication date reported by the CVE source.
- Feb 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=* <=0.9.123
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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