What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-30 · updated 2026-10-25
• Weakness: CWE-307

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

• KTM System e-BOK: before 06.2026 — fixed in 06.2026

How to fix

Upgrade to a fixed version: KTM System e-BOK 06.2026. Check the vendor advisory for mitigations.

References

• https://cert.pl/posts/2026/06/CVE-2026-35095/
• https://ktmsystem.pl/internetowe-biuro-obslugi-klienta/

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