# CVE-2026-35098: KTM System e-BOK improper rate limiting in login

Source: https://junglewise.ai/threats/cve-2026-35098-ktm-system-e-bok-improper-rate-limiting-in-login  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-30. Updated: 2026-06-30  
License: CC BY 4.0 with a link back

CVE-2026-35098 · Severity: info · CVSS 6.9 · Published 2026-06-30

KTM System e-BOK is a web portal used by housing cooperative residents to manage personal data and view financial settlements. A security flaw in the login system allows attackers to make unlimited password guesses without being locked out. Because the system also restricts passwords to simple six-digit numbers, an attacker could quickly gain unauthorized access to resident accounts and sensitive financial information.

Technologies: [KTM System e-BOK](https://junglewise.ai/threats/technologies/e-bok). Vendors: [KTM System](https://junglewise.ai/threats/vendors/ktm-system).

## Quick answers

**Is CVE-2026-35098 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-35098 being exploited in the wild.

**How severe is CVE-2026-35098?** Informational severity, with a CVSS score of 6.9, published 30 June 2026.

**Which products and versions are affected?** KTM System e-BOK All versions prior to June 2026 update.

**Is there a fix for CVE-2026-35098?** A patch was published on 2026-06-01: Patch released in June 2026 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-35098 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-35098?** Check whether you run KTM System e-BOK at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The KTM System e-BOK web application suffers from an improper restriction of excessive authentication attempts (CWE-307). The application fails to implement rate-limiting, account lockout, or progressive delays on the login interface. This vulnerability is exacerbated by a related issue (CVE-2026-35097) that restricts user passwords to a six-digit numeric format. A remote, unauthenticated attacker can exploit this lack of throttling to perform a high-speed brute-force attack, successfully guessing the 1,000,000 possible password combinations in a short timeframe. The issue was addressed in a patch released in June 2026.

## Affected products

- KTM System e-BOK All versions prior to June 2026 update

## Timeline

- 2026-06-30: advisory: Advisory published by CERT.PL
- 2026-06-30: disclosed
- 2026-06-01: patched: Patch released in June 2026

## References

- [https://cert.pl/posts/2026/06/CVE-2026-35095/](https://cert.pl/posts/2026/06/CVE-2026-35095/)
- [https://ktmsystem.pl/internetowe-biuro-obslugi-klienta/](https://ktmsystem.pl/internetowe-biuro-obslugi-klienta/)

## Related threats

- [KTM System e-BOK weak password requirements](https://junglewise.ai/threats/cve-2026-35097-ktm-system-e-bok-weak-password-requirements)
- [KTM System e-BOK CSRF in email and password change functions](https://junglewise.ai/threats/cve-2026-35096-ktm-system-e-bok-csrf-in-email-and-password-change-functions)
- [KTM System e-BOK session fixation](https://junglewise.ai/threats/cve-2026-35095-ktm-system-e-bok-session-fixation)