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FKIE_CVE-2026-19872

Vulnerability from fkie_nvd - Published: 2026-09-08 20:17 - Updated: 2026-09-10 18:17
Severity
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted value rendered unescaped in an error message. The wrappers and renderers that emit a form's errors interpolate the error string straight into HTML with no escaping. Two of the library's own messages, no_match and not_allowed, splice the submitted value into that string, and a failing type constraint puts the rejected value into the message it builds, which _apply_actions hands to add_error. A field declared with a check regexp, a check list or a type constraint reaches those messages, with no custom validator and no non-default configuration. Errors rendered through an application's own escaping template layer rather than the library's rendering roles are not affected. A request over the network that submits markup to such a field gets it back live inside the error span, running script in the victim's origin. Re-rendering a rejected value later gives the stored variant.
References
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://github.com/gshank/html-formhandler/commit/2574fdb4561f5c32d44cfbfbb3188345d49eb5a2.patch
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/ABRAXXA/HTML-FormHandler-0.410000/changes
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/09/08/15
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "HTML::FormHandler"
          ],
          "packageName": "HTML-FormHandler",
          "packageURL": "pkg:cpan/HTML-FormHandler",
          "programFiles": [
            "lib/HTML/FormHandler/Validate.pm",
            "lib/HTML/FormHandler/Render/Simple.pm",
            "lib/HTML/FormHandler/Render/Table.pm",
            "lib/HTML/FormHandler/Widget/Form/Simple.pm",
            "lib/HTML/FormHandler/Widget/Theme/BootstrapFormMessages.pm",
            "lib/HTML/FormHandler/Widget/Wrapper/Fieldset.pm",
            "lib/HTML/FormHandler/Widget/Wrapper/Simple.pm",
            "lib/HTML/FormHandler/Widget/Wrapper/SimpleInline.pm",
            "lib/HTML/FormHandler/Widget/Wrapper/Table.pm",
            "lib/HTML/FormHandler/Widget/Wrapper/TableInline.pm"
          ],
          "programRoutines": [
            {
              "name": "HTML::FormHandler::Validate::_apply_actions"
            },
            {
              "name": "HTML::FormHandler::Render::Simple::render_form_errors"
            },
            {
              "name": "HTML::FormHandler::Render::Simple::wrap_field"
            },
            {
              "name": "HTML::FormHandler::Render::Table::render_form_errors"
            },
            {
              "name": "HTML::FormHandler::Render::Table::wrap_field"
            },
            {
              "name": "HTML::FormHandler::Widget::Form::Simple::render_form_messages"
            },
            {
              "name": "HTML::FormHandler::Widget::Theme::BootstrapFormMessages::render_form_messages"
            },
            {
              "name": "HTML::FormHandler::Widget::Wrapper::Fieldset::wrap_field"
            },
            {
              "name": "HTML::FormHandler::Widget::Wrapper::Simple::wrap_field"
            },
            {
              "name": "HTML::FormHandler::Widget::Wrapper::SimpleInline::wrap_field"
            },
            {
              "name": "HTML::FormHandler::Widget::Wrapper::Table::wrap_field"
            },
            {
              "name": "HTML::FormHandler::Widget::Wrapper::TableInline::wrap_field"
            }
          ],
          "repo": "https://github.com/gshank/html-formhandler",
          "versions": [
            {
              "lessThan": "0.410000",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted value rendered unescaped in an error message.\n\nThe wrappers and renderers that emit a form\u0027s errors interpolate the error string straight into HTML with no escaping. Two of the library\u0027s own messages, no_match and not_allowed, splice the submitted value into that string, and a failing type constraint puts the rejected value into the message it builds, which _apply_actions hands to add_error.\n\nA field declared with a check regexp, a check list or a type constraint reaches those messages, with no custom validator and no non-default configuration. Errors rendered through an application\u0027s own escaping template layer rather than the library\u0027s rendering roles are not affected.\n\nA request over the network that submits markup to such a field gets it back live inside the error span, running script in the victim\u0027s origin. Re-rendering a rejected value later gives the stored variant."
    }
  ],
  "id": "CVE-2026-19872",
  "lastModified": "2026-09-10T18:17:58.827",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-19872",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-10T17:51:07.811981Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-08T20:17:29.850",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/gshank/html-formhandler/commit/2574fdb4561f5c32d44cfbfbb3188345d49eb5a2.patch"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/ABRAXXA/HTML-FormHandler-0.410000/changes"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/08/15"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}



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