Vulnerabilities

Vulnerability · CVE-2026-83539

Improper neutralization of input during web page generation in Apache Wicket.

Published Nov 1, 2026 · catalog updated Nov 1, 2026 · Improper neutralization of input

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

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No confirmed exploitation is on record for CVE-2026-83539. EPSS is 0.30%. Act only if a listed version of Improper neutralization of input is installed.

Severity

High7.4

Known exploitation

Not in CISA/VulnCheck KEV

EPSS

0.30%

Remediation

Not established

Affected products

See sources for product scope

Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.extensions.markup.html.basic.SmartLinkLabel and org.apache.wicket.extensions.markup.html.basic.SmartLinkMultiLineLabel display a text value and turn any URL they find in it into a hyperlink. Both escape the model value and then hand the escaped text to org.apache.wicket.extensions.markup.html.basic.DefaultLinkParser, which searches it for anything of the form scheme://rest and wraps each match in an anchor whose href is the matched text, copied in as it is. The pattern accepts any scheme, and there is no list of permitted schemes anywhere on the path. A text value naming a scheme that executes script therefore becomes an anchor that executes it, in the application's origin and in the reader's own session, when the reader clicks the link. Rendering the page is not enough on its own; the link has to be activated. Escaping does not prevent this and is not the issue: the characters the payload needs are all valid in a URL and are ones that org.apache.wicket.util.string.Strings#escapeMarkup() leaves alone, and the value ends up in a URL rather than in element text, which is a context that escaping model data does not make safe. An application is affected where it renders text it received through either of these two components. That is what they are for: they exist to linkify email addresses and web URLs found in the data an application is displaying, so untrusted input is the purpose of the feature rather than a misuse of it, and no unusual configuration is involved. No other component uses this parser, and an application that uses neither SmartLinkLabel nor SmartLinkMultiLineLabel is not affected. On 9.x and 10.x the Content-Security-Policy Wicket sends by default admits script only from a source carrying a per-response nonce, and a URL whose scheme executes script cannot carry one, so that default policy stops the script from running. This is a property of the default policy

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.