CVE-2026-95863 Vulnerability Analysis & Exploit Details

CVE-2026-95863 Vulnerability Summary

CVE-2026-95863: Improper neutralization of input during web page generation in Apache Wicket. Apache Wicket generates JavaScript that refers to the elements it renders, and writes into that JavaScript two values it derives itself: a component's markup id, and the input name of a form component, which is built from component ids. Both are placed inside single-quoted JavaScript string literals without being escaped for that context, so a value containing a single quote or a backslash ends the literal, and what follows is parsed as script and runs in the application's origin when the page loads. A markup id is the value passed to org.apache.wicket.Component#setMarkupId(String), or the id attribute written in the component's markup, or an id Wicket generates, in that order. The first two are supplied by the application in an HTML context, where both characters are legal and where Wicket escapes them correctly when it writes the same value into the id attribute of the element; a generated id cannot contain either. An input name is derived from the ids of the components between the form and the form component, and a component id was rejected only for ':' and '~'. In org.apache.wicket:wicket-core on 9.x and 10.x, org.apache.wicket.markup.head.OnEventHeaderItem#forMarkupId(String, String, CharSequence) quotes the id it is given into a Wicket.Event.add call, and components in both wicket-core and wicket-extensions reach it through #forComponent(Component, String, CharSequence). On every affected version, org.apache.wicket.markup.html.form.Form writes its markup id and the id of its hidden-fields container into such literals, org.apache.wicket.markup.html.form.FormComponentUpdatingBehavior writes an input name, and org.apache.wicket.markup.html.form.upload.MultiFileUploadField writes two markup ids and an input name. On 8.x, Form also writes an input name into the action of a submitting link, and on 8.x and 9.x Form#appendDefaultButtonField writes an input name into a name attribute with no escaping at all, so a value containing a double quote escapes the attribute into markup. org.apache.wicket:wicket-extensions is affected in its own right and not only through wicket-core: AjaxEditableLabel, AjaxIndicatorAppender, AjaxDisableComponentListener, UploadProgressBar, KittenCaptchaPanel, Palette, FilterForm and, on 9.x and 10.x, TrapFocusBehavior and AjaxListPanel each build their own JavaScript containing a markup id. An application is affected where a markup id or a component id carries one of those characters. Wicket does not put one there itself, so the value comes from the application: an id set on a component, an id attribute in a template, or a component id derived from data. None of those is a JavaScript context from the application's point of view. The Content-Security-Policy that Apache Wicket 9.x and 10.x send by default does not prevent this. The generated script is written into a script element carrying the per-response nonce, so the injected code is part of a script the policy admits. The fixed versions check an id where it enters instead of escaping each place it is written. A component id and a markup id may no longer contain a quote, a backquote, a backslash, braces, angle brackets, a semicolon, an ampersand or a control character, and a markup id may not contain parentheses or square brackets either; a component constructed with such an id, or given such a markup id, fails with an exception. This issue affects Apache Wicket: from 8.0.0 through 8.19.0, from 9.0.0 through 9.24.0, from 10.0.0 through 10.11.0. Users of Apache Wicket 7.x or older, which are no longer supported, should upgrade to a supported version. Users are recommended to upgrade to version 8.20.0, 9.25.0 or 10.12.0, which fix the issue.

CVE-2026-95863 References

External References

• https://lists.apache.org/thread.html/5wg754b873tlnsc268myrwcoy9lt046v

CWE Common Weakness Enumeration

CAPEC Common Attack Pattern Enumeration and Classification

• XSS Using MIME Type Mismatch CAPEC-209 An adversary creates a file with scripting content but where the specified MIME type of the file is such that scripting is not expected. The adversary tricks the victim into accessing a URL that responds with the script file. Some browsers will detect that the specified MIME type of the file does not match the actual type of its content and will automatically switch to using an interpreter for the real content type. If the browser does not invoke script filters before doing this, the adversary's script may run on the target unsanitized, possibly revealing the victim's cookies or executing arbitrary script in their browser.
• DOM-Based XSS CAPEC-588 This type of attack is a form of Cross-Site Scripting (XSS) where a malicious script is inserted into the client-side HTML being parsed by a web browser. Content served by a vulnerable web application includes script code used to manipulate the Document Object Model (DOM). This script code either does not properly validate input, or does not perform proper output encoding, thus creating an opportunity for an adversary to inject a malicious script launch a XSS attack. A key distinction between other XSS attacks and DOM-based attacks is that in other XSS attacks, the malicious script runs when the vulnerable web page is initially loaded, while a DOM-based attack executes sometime after the page loads. Another distinction of DOM-based attacks is that in some cases, the malicious script is never sent to the vulnerable web server at all. An attack like this is guaranteed to bypass any server-side filtering attempts to protect users.
• Reflected XSS CAPEC-591 This type of attack is a form of Cross-Site Scripting (XSS) where a malicious script is "reflected" off a vulnerable web application and then executed by a victim's browser. The process starts with an adversary delivering a malicious script to a victim and convincing the victim to send the script to the vulnerable web application.
• Stored XSS CAPEC-592 An adversary utilizes a form of Cross-site Scripting (XSS) where a malicious script is persistently "stored" within the data storage of a vulnerable web application as valid input.
• Cross-Site Scripting (XSS) CAPEC-63 An adversary embeds malicious scripts in content that will be served to web browsers. The goal of the attack is for the target software, the client-side browser, to execute the script with the users' privilege level. An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute code and scripts. Web browsers, for example, have some simple security controls in place, but if a remote attacker is allowed to execute scripts (through injecting them in to user-generated content like bulletin boards) then these controls may be bypassed. Further, these attacks are very difficult for an end user to detect.
• AJAX Footprinting CAPEC-85 This attack utilizes the frequent client-server roundtrips in Ajax conversation to scan a system. While Ajax does not open up new vulnerabilities per se, it does optimize them from an attacker point of view. A common first step for an attacker is to footprint the target environment to understand what attacks will work. Since footprinting relies on enumeration, the conversational pattern of rapid, multiple requests and responses that are typical in Ajax applications enable an attacker to look for many vulnerabilities, well-known ports, network locations and so on. The knowledge gained through Ajax fingerprinting can be used to support other attacks, such as XSS.

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