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CVE-2026-19872

Estado: AplazadaMedia (6.1)—

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.

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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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Html Formhandler — Html FormhandlerAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-19872",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-19872",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-10T17:51:07.811981Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "repo": "https://github.com/gshank/html-formhandler",
          "modules": [
            "HTML::FormHandler"
          ],
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "0.410000",
              "versionType": "custom"
            }
          ],
          "packageURL": "pkg:cpan/HTML-FormHandler",
          "packageName": "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"
          ],
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "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"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-09-08T20:17:29.850",
  "references": [
    {
      "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": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/09/08/15",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "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'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.\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's own escaping template layer rather than the library's 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's origin. Re-rendering a rejected value later gives the stored variant."
    }
  ],
  "lastModified": "2026-09-10T18:17:58.827",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
}