Let's Encrypt · Vulnerability Disclosure

Lets Encrypt Vulnerability Disclosure

Vulnerability disclosure

Let’s Encrypt publishes a vulnerability disclosure policy for reporting security issues. A machine-readable /.well-known/security.txt is served. A dedicated security contact is published.

CertificatesLinux FoundationSecurityTLSACMEPKI
Program: security.txt present

Disclosure Policy

Security Contact

Contact
mailto:security@letsencrypt.org

Source

Vulnerability Disclosure

Raw ↑ 
generated: '2026-07-11'
method: searched
probe: true
source: https://letsencrypt.org/.well-known/security.txt
contact:
- mailto:security@letsencrypt.org
evidence:
- source: https://letsencrypt.org/.well-known/security.txt
  kind: security.txt (live probe)

Work with this as data

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Tools for security posture

4 MCP tools reach this
  • find_securityBrowse and filter every security artifact in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
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Call it yourself

curl for this page
This security artifact 
curl "https://apis.io/api/v1/security/lets-encrypt-vulnerability-disclosure"
All security posture 
curl "https://apis.io/api/v1/security?limit=25"

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