PT-2026-53888 · Ktm System · E-Bok

Jacek Korta · Published 2026-06-30 · Updated 2026-06-30 · CVE-2026-35098

Mitre

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

KTM System e-BOK does not implement any limit or timeout on consecutive login attempts, allowing an attacker to perform unlimited authentication requests. This lack of rate‑limiting enables efficient brute‑force attacks against user accounts. When combined with vulnerability CVE-2026-35097, where passwords are restricted to a six‑digit numeric format, this becomes a critical issue, as such passwords can be brute‑forced in a relatively short time.

This issue was fixed in the patch published in June 2026.

Fix

Improper Restriction of Excessive Authentication Attempts

Weakness Enumeration

CWE-307

Related Identifiers

CVE-2026-35098

Affected Products

E-Bok

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-35098 · Security Note
• https://cert.pl/posts/2026/06/CVE-2026-35095 · Note
• https://ktmsystem.pl/internetowe-biuro-obslugi-klienta · Note