What is CVE-2026-25101?

CVE-2026-25101 is a critical-severity vulnerability in Bludit, classified under Session Fixation. CVSS score: 9.8/10. Published 2026-03-27.

How severe is CVE-2026-25101?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Bludit

CVE-2026-25101

Bludit allows user's session identifier to be set before authentication. The value of this session ID stays the same after authentication. This behavior enables an attacker to fix a session ID for a victim and later hijack the authenticated session. This issue was fixed in version 3.17.2.

EPSS: 0.004 (28.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Bludit — versions 0

Weakness classification (CWE)

CWE-384 — Session Fixation

References

cvd@cert.pl (Third Party Advisory, third-party-advisory)
cvd@cert.pl (release-notes, Release Notes)

Frequently asked questions

What is CVE-2026-25101?: CVE-2026-25101 is a critical-severity vulnerability in Bludit, classified under Session Fixation. CVSS score: 9.8/10. Published 2026-03-27.
How severe is CVE-2026-25101?: Critical severity. CVSS v3 base score is 9.8 out of 10.