External risk intelligence

Apache Wicket allows attackers to take over user accounts

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-40010

A serious security flaw in Apache Wicket lets attackers steal user accounts by tricking users into clicking a bad link. This affects internet-facing applications and could let unauthorized individuals access sensitive data.

4Halo Surface Signal

Apache Wicket

8.0.0 to 8.17.09.0.0 to 9.22.010.0.0 to before 10.9.0

External exposure likelihood

Halo Surface Signal score for CVE-2026-40010

Apache Wicket is a Java framework used specifically to build web applications. These applications are commonly deployed as public-facing web portals and services that manage user sessions and authentication over the internet, making this session fixation vulnerability frequently reachable in real-world, internet-accessible deployments.

Horizon Alert

Summary of the vulnerability and why it matters

A session fixation vulnerability exists in Apache Wicket, allowing an attacker to hijack a user's session. This means an attacker could potentially take over a user's authenticated session if they can trick the user into clicking a malicious link.

  • Attackers can steal user sessions.
  • Affects internet-facing web applications.
  • Easy to exploit without prior access.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability to hijack user sessions in web applications built with affected versions of Apache Wicket. By manipulating session identifiers before a user's session is fully established, an attacker could impersonate a legitimate user, gaining unauthorized access to their account and data. This attack requires no prior authentication.

  • No authentication needed.
  • Target web application session binding.
  • Exploit before session creation.

Live Threat

Current exploitation, exposure, and threat context

The current threat landscape shows that session fixation vulnerabilities, especially in widely used web frameworks like Apache Wicket, present a persistent risk. Attackers favor such issues because they can lead to account takeover without needing to steal credentials directly. This particular vulnerability is attractive due to its potential for widespread impact across public-facing web applications.

  • Exploitable over the network.
  • No authentication required.
  • Affects popular web framework.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize patching or upgrading Apache Wicket to version 10.9.0 for affected services. If immediate patching is not feasible, implement web application firewall (WAF) rules to detect and block suspicious requests that could exploit session fixation vulnerabilities. Monitor logs for indicators of compromise related to session manipulation.

  • Upgrade Apache Wicket to 10.9.0.
  • Implement WAF rules for session fixation.
  • Monitor for session manipulation anomalies.

Frequently asked questions

What is Apache Wicket?

Apache Wicket is a Java-based framework for building dynamic and interactive web applications. It is commonly used for creating user-facing portals and services.

How does CVE-2026-40010 lead to session fixation?

CVE-2026-40010 exploits a weakness classified as CWE-384, session fixation. This occurs when Apache Wicket fails to properly invoke a method after session binding. An attacker can exploit this by setting a session ID that a legitimate user then adopts, thereby fixing their session to one controlled by the attacker. This can allow an attacker to take over a user's authenticated session.

What versions of Apache Wicket are affected by CVE-2026-40010?

Apache Wicket versions from 8.0.0 through 8.17.0, version 9.0.0 through 9.22.0, and versions 10.0.0 through 10.8.0 are affected by this vulnerability.

What is the impact of CVE-2026-40010 on web applications?

This vulnerability allows an attacker to hijack user sessions in web applications built with affected Apache Wicket versions. By manipulating session identifiers before a user's session is fully established, an attacker can impersonate a legitimate user, gaining unauthorized access to their account and data. Exploitation requires no prior authentication and can be performed over the network.

How can organizations mitigate the risks associated with CVE-2026-40010?

To address CVE-2026-40010, it is recommended to upgrade Apache Wicket to version 10.9.0. If immediate patching is not possible, consider implementing web application firewall (WAF) rules to detect and block suspicious requests related to session fixation. Continuous monitoring of system logs for signs of session manipulation is also advised.

References