packets.sh

Mijn Simyo

Coordinated disclosure · 2026

Several critical and high-severity vulnerabilities in the Mijn Simyo app and API, reported to KPN-CERT.

Coordinated disclosureCERT#2026052777000311
Target
Mijn Simyo app and API
Vendor
Simyo (KPN)
Reported to
KPN-CERT
Reported
May 2026
Severity
Critical and high
KPN-CERT Hall of Fame
Summary of the report to KPN-CERT

In May 2026 I reported several critical and high-severity vulnerabilities in the Mijn Simyo app and API by Simyo (KPN) through coordinated disclosure to KPN-CERT, under reference CERT#2026052777000311.

For this I was listed in the KPN-CERT Hall of Fame.