CVE-2026-1357 in the critical feed json
Migration, Backup, Staging <= 0.9.123 - Unauthenticated Arbitrary File Upload
published 2026-02-11 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-5948
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 39.0%
- EPSS 39.0% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
- wpvivid wpvivid_backup_&_migration 0.9.124
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 8 mo ago
Exploit prediction
39.02% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template WPvivid Backup & Migration <= 0.9.123 - Arbitrary File Upload nuclei detection template
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- wpvividplugins WPvivid — Backup, Migration & Staging
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/e5af0317-ef46-4744-9752-74ce228b5f37?source=cve
- plugins.trac.wordpress.org /browser/wpvivid-backuprestore/trunk/includes/class-wpvivid-crypt.php#L58
- plugins.trac.wordpress.org /browser/wpvivid-backuprestore/tags/0.9.122/includes/class-wpvivid-crypt.php#L58
- plugins.trac.wordpress.org /browser/wpvivid-backuprestore/tags/0.9.123/includes/class-wpvivid-crypt.php#L58
- plugins.trac.wordpress.org /browser/wpvivid-backuprestore/trunk/includes/customclass/class-wpvivid-send-to-site.php#L629
- plugins.trac.wordpress.org /browser/wpvivid-backuprestore/tags/0.9.122/includes/customclass/class-wpvivid-send-to-site.php#L629
- plugins.trac.wordpress.org /browser/wpvivid-backuprestore/tags/0.9.123/includes/customclass/class-wpvivid-send-to-site.php#L629
- plugins.trac.wordpress.org /changeset/3448386/wpvivid-backuprestore#file1
Sources
- CVE List CVE-2026-1357
- NVD CVE-2026-1357
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.