CVE-2026-40010Network attack vector

Session hijacking via retained pre-authentication identifier

Published May 6, 2026 · Updated May 6, 2026

Session fixation in Apache Wicket 8.0.0 through 8.17.0, 9.0.0 through 9.22.0, and 10.0.0 through 10.8.0 allows remote attackers to hijack sessions. AuthenticatedWebSession binds the authenticated session without invoking the Servlet request's changeSessionId method, leaving the pre-authentication identifier valid. Exploitation requires fixing that identifier in a victim browser before sign-in; subsequent reuse grants the victim's authenticated access without affecting service availability.

CVSS severity9.1
Critical
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session fixation in Apache Wicket 8.0.0 through 8.17.0, 9.0.0 through 9.22.0, and 10.0.0 through 10.8.0 allows remote attackers to hijack sessions. AuthenticatedWebSession binds the authenticated session without invoking the Servlet request's changeSessionId method, leaving the pre-authentication identifier valid. Exploitation requires fixing that identifier in a victim browser before sign-in; subsequent reuse grants the victim's authenticated access without affecting service availability.

The record

CVE
CVE-2026-40010
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Apache Software Foundation
Product
Apache Wicket
Classifications
CWE-384, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0 <=10.8.0
  2. Affected versionversion=8.0.0 <=8.17.0
  3. Affected versionversion=9.0.0 <=9.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Wicketversion=10.0.0 <=10.8.0; version=8.0.0 <=8.17.0; version=9.0.0 <=9.22.0

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-384Session Fixation
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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