Vulnerability-Lookup

GHSA-788M-QHXV-M7F3

Vulnerability from github – Published: 2026-08-31 12:30 – Updated: 2026-09-01 18:30

Details

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

org.apache.wicket.markup.html.form.Button clears the escape-model-strings flag in its constructor, so that the value attribute it writes is not encoded twice — ComponentTag already encodes attribute values when it writes the tag. That reasoning holds only for the attribute. When the component is attached to a element rather than an , it writes its model object into the element body instead, and nothing encodes an element body, so markup in the model is rendered as markup.

An application is affected where it renders a Button on a element and that button's model holds data an attacker can influence. Wicket cannot determine where a model value comes from, so whether it reaches the page from a request or from storage is a property of the application. The subclasses that inherit this constructor — AjaxButton, AjaxFallbackButton and WizardButton — are affected on the same terms.

As a workaround, calling setEscapeModelStrings(true) on a button that renders as a element escapes the body correctly, and does not cause double encoding, because the value attribute is written only for elements.

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 6.25.0 and 7.5.0 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.

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

5.1 (Medium)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-76982"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-31T12:17:57Z",
    "severity": "MODERATE"
  },
  "details": "Improper neutralization of input during web page generation in Apache Wicket.\n\norg.apache.wicket.markup.html.form.Button clears the escape-model-strings flag in its constructor, so that the value attribute it writes is not encoded twice \u2014 ComponentTag already encodes attribute values when it writes the tag. That reasoning holds only for the attribute. When the component is attached to a \u003cbutton\u003e element rather than an \u003cinput\u003e, it writes its model object into the element body instead, and nothing encodes an element body, so markup in the model is rendered as markup.\n\nAn application is affected where it renders a Button on a \u003cbutton\u003e element and that button\u0027s model holds data an attacker can influence. Wicket cannot determine where a model value comes from, so whether it reaches the page from a request or from storage is a property of the application. The subclasses that inherit this constructor \u2014 AjaxButton, AjaxFallbackButton and WizardButton \u2014 are affected on the same terms.\n\nAs a workaround, calling setEscapeModelStrings(true) on a button that renders as a \u003cbutton\u003e element escapes the body correctly, and does not cause double encoding, because the value attribute is written only for \u003cinput\u003e elements.\n\nThis 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 6.25.0 and 7.5.0 onwards are also affected.\n\nUsers are recommended to upgrade to version 8.19.0, 9.24.0 or 10.11.0, which fix the issue.",
  "id": "GHSA-788m-qhxv-m7f3",
  "modified": "2026-09-01T18:30:34Z",
  "published": "2026-08-31T12:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76982"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/bhcfrz61o4bv0olktybvgqft8km9wfrd"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/08/31/2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-76982 (GCVE-0-2026-76982)

Vulnerability from cvelistv5 – Published: 2026-08-31 11:52 – Updated: 2026-08-31 14:19

Title

Apache Wicket: XSS in Button via its model object

Summary

Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.markup.html.form.Button clears the escape-model-strings flag in its constructor, so that the value attribute it writes is not encoded twice — ComponentTag already encodes attribute values when it writes the tag. That reasoning holds only for the attribute. When the component is attached to a <button> element rather than an <input>, it writes its model object into the element body instead, and nothing encodes an element body, so markup in the model is rendered as markup. An application is affected where it renders a Button on a <button> element and that button's model holds data an attacker can influence. Wicket cannot determine where a model value comes from, so whether it reaches the page from a request or from storage is a property of the application. The subclasses that inherit this constructor — AjaxButton, AjaxFallbackButton and WizardButton — are affected on the same terms. As a workaround, calling setEscapeModelStrings(true) on a button that renders as a <button> element escapes the body correctly, and does not cause double encoding, because the value attribute is written only for <input> elements. 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 6.25.0 and 7.5.0 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.

Severity

5.1 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-31 14:18 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

apache mitre root

References

2 references

URL	Tags
https://lists.apache.org/thread/bhcfrz61o4bv0olkt…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/08/31/2

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache Wicket	Affected: 8.0.0 , ≤ 8.18.0 (semver) Affected: 9.0.0 , ≤ 9.23.0 (semver) Affected: 10.0.0 , ≤ 10.10.0 (semver)

Credits

Emond Papegaaij

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-788M-QHXV-M7F3

CVE-2026-76982 (GCVE-0-2026-76982)

Tags

Sightings

Nomenclature