Medium5.1Apache Software Foundation

Medium [CVE-2026-76985] Apache Wicket: XSS in Palette via getAdditionalAttributes

This medium-severity Apache Software Foundation advisory covers CVE-2026-76985 affecting Apache Wicket.

CVE-2026-76985 Published Aug 31, 2026Updated by vendor Aug 31, 2026

CVE-2026-76985

Affected products & platforms

Apache Software FoundationUnclassified

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Summary

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

org.apache.wicket.extensions.markup.html.form.palette.component. AbstractOptions, which renders the two option lists of a Palette, escapes the id and the display value of each option according to the escape-model-strings setting, and wrote the attribute names and values returned by getAdditionalAttributes into the tag as they came.

An application is affected where it overrides Palette.getAdditionalAttributesForChoices, Palette.getAdditionalAttributesForSelection or AbstractOptions.getAdditionalAttributes and returns a value holding data an attacker can influence. These methods return null by default, so an application that does not override them is not affected.

As a workaround, escape the values in the override.

This issue affects Apache Wicket: from 8.0.0 through 8.18.0, from 9.0.0 through 9.23.0, from 10.0.0 through 10.10.0. Older, unsupported releases from 1.4.0 onwards are also affected.

Users are recommended to upgrade to version 8.19.0, 9.24.0 or 10.11.0, which fix the issue.

Affected versions

Apache Wicket 8.0.0 through 8.18.0
Apache Wicket 9.0.0 through 9.23.0
Apache Wicket 10.0.0 through 10.10.0

Official advisory · high-confidence parse· fetched 47 minutes ago·verify at source

Fixed versions

8.19.0
9.24.0
10.11.0

Official advisory · high-confidence parse· fetched 47 minutes ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Users are recommended to upgrade to version 8.19.0, 9.24.0 or 10.11.0, which fix the issue.

Official advisory · high-confidence parse· fetched 47 minutes ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-76985 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-76985NVD CVE.org MITRE

Official resources

ASF Security — reporting & CVE process
Official documentation
The Apache Software Foundation's official security page: how ASF CVEs are published and where each project's advisories live.
Apache project downloads (fixed releases)
Official documentation
Official ASF download tree — fetch the fixed release named in this advisory from the project's directory.

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