What is CVE-2026-40010?

CVE-2026-40010 is a critical-severity vulnerability in Apache Wicket, classified under Session Fixation. CVSS score: 9.1/10. Published 2026-05-06.

How severe is CVE-2026-40010?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Apache Wicket

CVE-2026-40010

Missing invocation of Servlet http web request method changeSessionId after session binding can be exploited for a session fixation attack in Apache Wicket. This issue affects Apache Wicket: from 8.0.0 through 8.17.0, 9.0.0, from 10.0.0 through 10.8.0. Users are recommended to upgrade to version 10.9.0, which fixes the issue.

Published 2026-05-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.7th percentile), scored 2026-10-22.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002

Affected products

Apache Wicket
Apache Software Foundation Wicket — versions 10.0.0, 8.0.0, 9.0.0

Weakness classification (CWE)

CWE-384 — Session Fixation

References

lists.apache.org/thread/61wsc0xdtfd5oozojfx7by9w3jwgkmv1 (vendor-advisory, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-40010?: CVE-2026-40010 is a critical-severity vulnerability in Apache Wicket, classified under Session Fixation. CVSS score: 9.1/10. Published 2026-05-06.
How severe is CVE-2026-40010?: Critical severity. CVSS v3 base score is 9.1 out of 10.