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

CVE-2026-35095Session fixation in KTM System e-BOK

Medium 4.8

In plain English

A medium-severity session fixation 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 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 4.0)4.8Medium

Exploit odds (30 days)0.2%top 88.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

KTM System e-BOK allows the session identifier to be set by the client prior to authentication. If a cookie with a valid name is set, its value remains unchanged after successful login. This behaviour enables an attacker to fix a session ID for a victim and later hijack the authenticated session. 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-384 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/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