Vulnerability · Published Jun 30, 2026 · Assigned by CERT-PL

CVE-2026-35098Improper Restriction of Excessive Authentication Attempts in KTM System e-BOK

Medium 6.9

In plain English

A medium-severity security flaw in e-BOK from KTM System. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.6%top 52.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
KTM System	e-BOK	0 – before 06.2026

Weakness: CWE-307 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

References

https://cert.pl/posts/2026/06/CVE-2026-35095/ third-party-advisory
https://ktmsystem.pl/internetowe-biuro-obslugi-klienta/ product