generated: '2026-07-27'
method: searched
probe: true
source: >-
  https://ssentransmission.opendatasoft.com/.well-known/security.txt (HTTP 200,
  fetched 2026-07-27) plus a negative sweep of SSEN's own security/disclosure
  paths.
description: >-
  SSEN publishes no vulnerability-disclosure policy, bug-bounty programme or
  security.txt of its own on any SSEN-controlled host. The only machine-readable
  security contact reachable on an SSEN API surface is the RFC 9116 security.txt
  served on the SSEN Transmission Open Data Portal host — which belongs to
  Opendatasoft, the platform vendor that operates that portal. It is recorded
  here because it is the real, reachable disclosure channel for that API host,
  and it is attributed to the vendor so it is never mistaken for an SSEN
  programme.
ssen_authored_policy: false
policy:
  - https://ssentransmission.opendatasoft.com/.well-known/security.txt
contact:
  - mailto:security@opendatasoft.com
bug_bounty: none found
programs_checked: [HackerOne, Bugcrowd, Intigriti]
evidence:
  - source: https://ssentransmission.opendatasoft.com/.well-known/security.txt
    kind: security.txt
    status: 200
    standard: RFC 9116
    authored_by: Opendatasoft (platform vendor for the SSEN Transmission portal)
    contact: mailto:security@opendatasoft.com
    expires: '2050-01-01T11:00:00.000Z'
    file: well-known/ssen-security.txt
negative_probes:
  - {url: 'https://www.ssen.co.uk/.well-known/security.txt', status: 404}
  - {url: 'https://www.ssen.co.uk/security/', status: 404}
  - {url: 'https://www.ssen.co.uk/responsible-disclosure/', status: 404}
  - {url: 'https://www.ssen-transmission.co.uk/.well-known/security.txt', status: 404}
  - {url: 'https://data.ssen.co.uk/.well-known/security.txt', status: 404}
  - {url: 'https://external.distribution.prd.ssen.co.uk/.well-known/security.txt', status: 404}
  - {url: 'https://nerda.opengrid.com/.well-known/security.txt', status: 404}
  - {url: 'https://www.sse.com/.well-known/security.txt', status: 404}
  - {url: 'https://www.sse.com/security/', status: 404}
gap: >-
  A GB distribution and transmission network operator publishing grid asset,
  substation and real-time outage data has no published route for a researcher
  to report a vulnerability in those APIs. An SSEN-authored /.well-known/
  security.txt on www.ssen.co.uk, data-api.ssen.co.uk and the Power Track host
  would close this at near-zero cost.