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CVE-2026-76984— Apache Wicket: XSS in MetaDataHeaderItem via addTagAttribute

Quick assessment

Affected
Apache Software Foundation Apache Wicket
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Wicket是美国Apache基金会的一款Java Web应用开发框架。 Apache Wicket 8.0.0至8.18.0版本、9.0.0至9.23.0版本和10.0.0至10.10.0版本存在跨站脚本漏洞，该漏洞源于网页生成期间输入中和不当，可能导致跨站脚本攻击。此外，Apache Wicket 6.17.0及之后的不支持版本也受影响。

CVSS 5.1 · Medium EPSS 0.51% · P42

Affected Version Matrix 3

VendorProduct Version RangeStatus
Apache Software Foundation Apache Wicket 8.0.0≤ 8.18.0 affected
9.0.0≤ 9.23.0 affected
10.0.0≤ 10.10.0 affected
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I. Basic Information for CVE-2026-76984

Vulnerability Information
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Vulnerability Title
Apache Wicket: XSS in MetaDataHeaderItem via addTagAttribute
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.markup.head.MetaDataHeaderItem generates <meta> and <link> 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Wicket 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Wicket是美国Apache基金会的一款Java Web应用开发框架。 Apache Wicket 8.0.0至8.18.0版本、9.0.0至9.23.0版本和10.0.0至10.10.0版本存在跨站脚本漏洞，该漏洞源于网页生成期间输入中和不当，可能导致跨站脚本攻击。此外，Apache Wicket 6.17.0及之后的不支持版本也受影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Wicket 8.0.0 ~ 8.18.0 -

II. Public POCs for CVE-2026-76984

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III. Intelligence Information for CVE-2026-76984

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Mailing List Discussions for CVE-2026-76984 (1)

Same Patch Batch · Apache Software Foundation · 2026-08-31 · 10 CVEs total

CVE-2026-58301 5.9 MEDIUM Apache Shiro: Server-side POST request may be steered to an alternate host
CVE-2026-76985 5.1 MEDIUM Apache Wicket: XSS in Palette via getAdditionalAttributes
CVE-2026-76983 5.1 MEDIUM Apache Wicket: XSS in AutoLabelTextResolver via FormComponent.setLabel
CVE-2026-76982 5.1 MEDIUM Apache Wicket: XSS in Button via its model object
CVE-2026-75802 5.1 MEDIUM Apache Wicket: XSS in AjaxEditableLabel and its subclasses via IChoiceRenderer and default
CVE-2026-76986 Apache Wicket: XSS in AbstractSingleSelectChoice via getNullValidDisplayValue
CVE-2026-71378 Apache Wicket: Cross-Site Request Forgery (CSRF) protection bypass in ResourceIsolationReq
CVE-2026-71257 Apache Wicket: Configured file upload limits are not enforced when the multipart request h
CVE-2026-70449 Apache Wicket: Path traversal in resource style/variation/locale

IV. Related Vulnerabilities

Same product: Apache Wicket
Same vendor: Apache Software Foundation
Same weakness: CWE-79

V. Comments for CVE-2026-76984

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