Medium [CVE-2026-76984] Improper neutralization of input during web page generation in Apache Wicket
This medium-severity Apache Software Foundation advisory covers CVE-2026-76984 affecting Apache Wicket.
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Summary
Improper neutralization of input during web page generation in Apache Wicket.
org.apache.wicket.markup.head. MetaDataHeaderItem generates and header tags.
It escaped the attribute names it wrote, but ran the attribute values through a replacement of " with \". A backslash before a double quote means nothing in HTML, so a value containing a double quote ends its own attribute and what follows is parsed as further attributes of the generated tag.
An application is affected where it supplies an attribute value holding data an attacker can influence, through addTagAttribute or the forMetaTag and forLinkTag factory methods. A value may be given as an IModel, so it is not necessarily a literal.
There is no setting to change; an application can only avoid supplying a value that contains a double quote. Note that these values have never been escaped effectively: before the change released in 6.24.0, 7.4.0 and 8.0.0 they were written with no escaping at all.
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 6.17.0 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.
- 8.0.0 through 8.18.0
- 9.0.0 through 9.23.0
- 10.0.0 through 10.10.0.
- through 10.10.0
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 8.19.0
- 9.24.0
- 10.11.0
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- 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 2 months ago·verify at source
More Apache Software Foundation advisories
- CVE-2026-76986Aug 31, 2026Apache Wicket cross-site scripting (XSS)
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- CVE-2026-76983Aug 31, 2026Apache Wicket cross-site scripting (XSS)
- CVE-2026-76982Aug 31, 2026Apache Wicket cross-site scripting (XSS)
- CVE-2026-75802Aug 31, 2026Apache Wicket: AjaxEditableChoiceLabel in wicket-extensions, when constructed
- CVE-2026-71378Aug 31, 2026Apache Wicket: ResourceIsolationRequestCycleListener protects a Wicket application against
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