CVE-2026-82704
MediumCVSS 6.9Summary
Apache Wicket has a missing authorization flaw that allows a component's listener to be invoked even when the authorization strategy denied the RENDER action for it. A crafted or even standard listener URL without a page identifier skips the render phase and Component#configure(), leaving the visibility flag at its constructor default. Components hidden or disabled in Component#onConfigure() are equally exposed.
Risk Assessment
An attacker can invoke actions of components the application intentionally withheld from the caller, potentially leading to unauthorized access to functionality or data. Additionally, a listener on a stateful page operates on models built from caller-supplied page parameters rather than the last rendered state.
Recommendation
Upgrade Apache Wicket to version 8.20.0, 9.25.0 or 10.12.0. Until patched, do not rely solely on denying RENDER or on Component#onConfigure() to protect individual components — enforce access control at the page or instantiation level.
Other vulnerabilities in Apache Wicket
See all- CVE-2026-95863High
Apache Wicket generates JavaScript that references rendered elements, placing markup ids and form input names inside single-quoted JavaScript string literals without proper escaping. A value containing a single quote or backslash can terminate the literal and inject script that runs in the application's origin when the page loads. The issue affects wicket-core and wicket-extensions in versions 8.0.0 through 8.19.0, 9.0.0 through 9.24.0, and 10.0.0 through 10.11.0.
- CVE-2026-87718Low
Apache Wicket 10.10.0, 10.11.0 and 9.24.0 do not set Content-Security-Policy headers on a page whose render request handler is wrapped in more than one IRequestHandlerDelegate. The framework unwraps only a single delegate level when deciding whether a request renders a page, so with a deeper chain, for example an application-provided delegating request mapper combined with CryptoMapper, the page is served without any CSP header even though CSP is enabled, and no error or warning is raised. The nonce-based protection Wicket applies to inline scripts and styles, together with any other CSP directives configured by the application, is thereby lost for those pages, exposing them to content injection the policy was meant to prevent. Applications on stock Wicket that do not wrap request handlers themselves are not affected. Versions before 10.10.0 and 9.24.0 handled nested delegates correctly.
- CVE-2026-84231High
A cross-site scripting (XSS) vulnerability in Apache Wicket arises from improper neutralization of input during web page generation. The ExternalLink component, when bound to a non-anchor element, concatenates the model URL into a JavaScript string literal in the onclick attribute without proper escaping, allowing script execution in the application's origin.
- CVE-2026-84177Medium
Apache Wicket has an incorrect behavior order: a file path is validated by PackageResourceGuard before the framework appends the style, variation and locale attributes. As a result, the file opened may differ from the file approved by the guard, allowing disclosure of HTML markup templates of components whose class names contain an underscore (e.g. Report_v2).
- CVE-2026-84172Medium
In Apache Wicket, PackageResourceGuard incorrectly allows component markup templates to be served as package resources when wicket-core is loaded by a class loader that cannot see the application's classes. In such a setup the check for a class file beside the template fails, and a request for the package resource URL returns the component's markup template with status 200. Disclosed content is developer-authored template material such as component structure, comments, inline script, and named endpoints.
- CVE-2026-84170High
A vulnerability in Apache Wicket affects AbstractFileUploadResource, the server side of the form-less upload offered by FileUploadToResourceField. The request size, single-part size and part-count limits are taken from request parameters (maxSize, fileMaxSize, fileCountMax) instead of application configuration, so a client can raise or omit them. The resource carries no authorization annotation, so by default requests need no authentication.
- CVE-2026-83594High
A vulnerability in Apache Wicket affects the FileUploadToResourceField component, whose Ajax callback reads the filesInfo request parameter without binding it to an actual upload. The UploadInfo#get() method allocates a byte array based on the client-supplied size, allowing a single request to exhaust the JVM heap, while negative values trigger a NegativeArraySizeException.
- CVE-2026-83559High
A vulnerability in Apache Wicket affects the JavaScriptUtils#escapeQuotes() method, which fails to escape the backslash character before quotes. A value containing a backslash immediately before a quote results in the quote being left unescaped, closing the JavaScript string literal and allowing JavaScript injection. The issue occurs when an application uses this method to place attacker-influenced data inside a JavaScript string literal, including via the AjaxEditableLabel component.
- CVE-2026-83539High
Cross-site scripting (XSS) vulnerability in the SmartLinkLabel and SmartLinkMultiLineLabel components of Apache Wicket. These components turn URLs found in text into hyperlinks and accept any URL scheme, including script-executing schemes such as javascript:. Escaping the model value does not help because the payload ends up in the href attribute rather than in element text.
- CVE-2026-82956High
A cross-site scripting (XSS) vulnerability in Apache Wicket affects the AjaxNewWindowNotifyingBehavior, which stores the client-supplied window.name value in the page's serialized state. That value is later substituted without escaping into a single-quoted JavaScript string literal in the Ajax call precondition, allowing arbitrary script execution in the application's origin on every render of the page instance. Only applications that explicitly add this behavior to a component are affected.
Original NVD description (English source)
Missing authorization in Apache Wicket. org.apache.wicket.core.request.handler.ListenerRequestHandler invokes an IRequestListener only when org.apache.wicket.Component#canCallListener() allows it, and that method is isEnabledInHierarchy() && isVisibleInHierarchy(). The visibility half reads a flag that carries the outcome of IAuthorizationStrategy#isActionAuthorized() for the Component.RENDER action, and that flag is written in one place only, Component#configure(), during the render phase. A listener URL built by a subclass of org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper carries the page identifier and the component path in a single parameter, and the page identifier may be empty. When it is, a new page instance is constructed, PageProvider#wasExpired() is false because no identifier was supplied, and PageAndComponentProvider#getComponent() finds the component directly on the new instance, so neither a render pass nor Component#configure() runs before the listener is invoked. The flag therefore still holds its constructor default, the component counts as visible, and the listener of a component the authorization strategy denied RENDER for is executed. The same request also skips Component#onConfigure(), so visibility and enablement an application sets there are not applied either. There are two ways to reach this, and neither requires anything but a request. On a page that is stateful, the caller omits the page identifier from a listener URL that would otherwise carry it. On a page that Wicket considers stateless, nothing has to be altered at all: Wicket itself writes listener URLs without a page identifier for such pages, and a component the strategy denies RENDER for is treated as stateless and therefore does not keep the page stateful, so denying RENDER can itself produce the page-id-less form. The second route has never been refused. The ENABLE decision of IAuthorizationStrategy is consulted on every invocation and still refuses, as does a request that supplies the real identifier of a page instance that has already been rendered; a component the application disabled in Component#onConfigure() is protected by neither, because that callback has not run. An application is affected where it withholds an individual component from the caller, either by denying the RENDER action through IAuthorizationStrategy, including through the MetaDataRoleAuthorizationStrategy and AuthorizeAction facilities of wicket-auth-roles, or by setting the component's visibility or enabled flag in Component#onConfigure(), the callback Wicket's own documentation directs applications to use for both. The page carrying such a component has to be constructible from a bookmarkable or mounted URL, which requires a public constructor taking either no arguments or a PageParameters argument. Behaviours pass through the same gate, so an AJAX behaviour attached to such a component is equally exposed. Separately, and whether or not any component is withheld, a listener on a page Wicket considers stateful is invoked on an instance the request itself constructed, so it acts on models built from page parameters the caller supplied rather than on the state the application last rendered. Instantiation authorization is unaffected: IAuthorizationStrategy#isInstantiationAuthorized() is still consulted when the new page instance is created, so a guard placed on the page rather than on the individual component continues to hold. 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 are recommended to upgrade to version 8.20.0, 9.25.0 or 10.12.0, which fix the issue.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS