Vulnerability-Lookup

GHSA-5445-5XCV-F4GR

Vulnerability from github – Published: 2026-08-31 12:30 – Updated: 2026-08-31 15:34

Details

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

The tag is provided by org.apache.wicket.markup.html.form.AutoLabelTextResolver, which is registered by default in every WebApplication. The resolver writes the label it finds into the markup as it is, and reads no escaping setting at all, so markup in a label is rendered as markup.

When the label comes from the labelled component's label model, set through FormComponent#setLabel(IModel), it is written to the markup unescaped. An application is affected where the label of a form component 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.

There is no workaround. Unlike every other rendering path in Wicket, the resolver never consulted the escape-model-strings setting, so an application had no way to ask for the label to be escaped.

The body of a tag is markup by design and is not affected; it remains the supported way to place markup in a label.

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 1.5.0 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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-76983"
  ],
  "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\nThe \u003cwicket:label\u003e tag is provided by org.apache.wicket.markup.html.form.AutoLabelTextResolver, which is registered by default in every WebApplication. The resolver writes the label it finds into the markup as it is, and reads no escaping setting at all, so markup in a label is rendered as markup.\n\nWhen the label comes from the labelled component\u0027s label model, set through FormComponent#setLabel(IModel), it is written to the markup unescaped.\u00a0An application is affected where the label of a form component 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.\n\nThere is no workaround. Unlike every other rendering path in Wicket, the resolver never consulted the escape-model-strings setting, so an application had no way to ask for the label to be escaped.\n\nThe body of a \u003cwicket:label\u003e tag is markup by design and is not affected; it remains the supported way to place markup in a label.\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 1.5.0 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.",
  "id": "GHSA-5445-5xcv-f4gr",
  "modified": "2026-08-31T15:34:42Z",
  "published": "2026-08-31T12:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76983"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/lfc9s9qkgxhm8ffscp9b7gjfgj47g25h"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/08/31/3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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-2026-76983 (GCVE-0-2026-76983)

Vulnerability from cvelistv5 – Published: 2026-08-31 11:56 – Updated: 2026-08-31 14:19

Title

Apache Wicket: XSS in AutoLabelTextResolver via FormComponent.setLabel

Summary

Improper neutralization of input during web page generation in Apache Wicket. The <wicket:label> tag is provided by org.apache.wicket.markup.html.form.AutoLabelTextResolver, which is registered by default in every WebApplication. The resolver writes the label it finds into the markup as it is, and reads no escaping setting at all, so markup in a label is rendered as markup. When the label comes from the labelled component's label model, set through FormComponent#setLabel(IModel), it is written to the markup unescaped. An application is affected where the label of a form component 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. There is no workaround. Unlike every other rendering path in Wicket, the resolver never consulted the escape-model-strings setting, so an application had no way to ask for the label to be escaped. The body of a <wicket:label> tag is markup by design and is not affected; it remains the supported way to place markup in a label. 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 1.5.0 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 14:19 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/lfc9s9qkgxhm8ffsc…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/08/31/3

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

Ho1aAs

Show details on NVD website

JSON

To clipboard

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          "dateUpdated": "2026-08-31T12:16:46.955Z",
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        "references": [
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-31T14:19:43.662081Z",
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          "dateUpdated": "2026-08-31T14:19:51.510Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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      "affected": [
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          "collectionURL": "https://repo.maven.apache.org/maven2",
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          "product": "Apache Wicket",
          "vendor": "Apache Software Foundation",
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            },
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              "lessThanOrEqual": "9.23.0",
              "status": "affected",
              "version": "9.0.0",
              "versionType": "semver"
            },
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      "credits": [
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        }
      ],
      "descriptions": [
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              "value": "Improper neutralization of input during web page generation in Apache Wicket.\u003cbr\u003e\u003cbr\u003eThe \u0026lt;wicket:label\u0026gt; tag is provided by org.apache.wicket.markup.html.form.AutoLabelTextResolver, which is registered by default in every WebApplication. The resolver writes the label it finds into the markup as it is, and reads no escaping setting at all, so markup in a label is rendered as markup.\u003cbr\u003e\u003cbr\u003eWhen the label comes from the labelled component\u0027s label model, set through FormComponent#setLabel(IModel), it is written to the markup unescaped.\u0026nbsp;An application is affected where the label of a form component 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.\u003cbr\u003e\u003cbr\u003eThere is no workaround. Unlike every other rendering path in Wicket, the resolver never consulted the escape-model-strings setting, so an application had no way to ask for the label to be escaped.\u003cbr\u003e\u003cbr\u003eThe body of a \u0026lt;wicket:label\u0026gt; tag is markup by design and is not affected; it remains the supported way to place markup in a label.\u003cbr\u003e\u003cbr\u003eThis 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 1.5.0 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.\u003cbr\u003e"
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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      "references": [
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          "url": "https://lists.apache.org/thread/lfc9s9qkgxhm8ffscp9b7gjfgj47g25h"
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "Apache Wicket: XSS in AutoLabelTextResolver via FormComponent.setLabel",
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    "datePublished": "2026-08-31T11:56:38.210Z",
    "dateReserved": "2026-08-20T06:50:42.261Z",
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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-5445-5XCV-F4GR

CVE-2026-76983 (GCVE-0-2026-76983)

Tags

Sightings

Nomenclature