Vulnerability-Lookup

CVE-2026-19872 (GCVE-0-2026-19872)

Vulnerability from cvelistv5 – Published: 2026-09-08 20:08 – Updated: 2026-09-10 17:51

Title

HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted value rendered unescaped in an error message

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.

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 17:51 UTC

CWE

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

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 64/100 over 265 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/gshank/html-formhandler/commit…	patch
https://metacpan.org/release/ABRAXXA/HTML-FormHan…	release-notes
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version	CPE status
		Affected: 0 , < 0.410000 (custom)

Show details on NVD website

JSON

To clipboard

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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

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/gshank/html-formhandler/commit/2574fdb4561f5c32d44cfbfbb3188345d49eb5a2.patch
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/ABRAXXA/HTML-FormHandler-0.410000/changes
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/09/08/15

Impacted products

	Vendor	Product	Version

JSON

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"
    }
  ]
}

GHSA-74PJ-VP7J-2F6M

Vulnerability from github – Published: 2026-09-08 21:34 – Updated: 2026-09-10 18:31

Details

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.

Severity

6.1 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-19872"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-08T20:17:29Z",
    "severity": "MODERATE"
  },
  "details": "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": "GHSA-74pj-vp7j-2f6m",
  "modified": "2026-09-10T18:31:33Z",
  "published": "2026-09-08T21:34:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19872"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gshank/html-formhandler/commit/2574fdb4561f5c32d44cfbfbb3188345d49eb5a2.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/ABRAXXA/HTML-FormHandler-0.410000/changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/08/15"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

OPENSUSE-SU-2026:11745-1

Vulnerability from csaf_opensuse - Published: 2026-09-10 00:00 - Updated: 2026-09-17 17:23

Summary

perl-HTML-FormHandler-0.410.2-1.1 on GA media

Severity

Moderate

Scope

5 vulnerabilities in this advisory, including CVE-2026-19872.

CVE-2026-19872

Recommended: 4 products

Open the full advisory

UBUNTU-CVE-2026-19872 (CVE-2026-19872)

Vulnerability from osv_ubuntu – Published: 2026-09-08 20:17 – Updated: 2026-09-16 11:31 – Source website

Details

Severity

6.1 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-19872	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-19872	REPORT
	https://lists.security.metacpan.org/cve-announce/…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-formhandler-perl",
            "binary_version": "0.40064-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "libhtml-formhandler-perl",
        "purl": "pkg:deb/ubuntu/libhtml-formhandler-perl@0.40064-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.40057-1",
        "0.40064-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-formhandler-perl",
            "binary_version": "0.40068-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libhtml-formhandler-perl",
        "purl": "pkg:deb/ubuntu/libhtml-formhandler-perl@0.40068-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.40067-1",
        "0.40068-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-formhandler-perl",
            "binary_version": "0.40068-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libhtml-formhandler-perl",
        "purl": "pkg:deb/ubuntu/libhtml-formhandler-perl@0.40068-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.40068-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-formhandler-perl",
            "binary_version": "0.40068-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libhtml-formhandler-perl",
        "purl": "pkg:deb/ubuntu/libhtml-formhandler-perl@0.40068-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.40068-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-formhandler-perl",
            "binary_version": "0.40068-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libhtml-formhandler-perl",
        "purl": "pkg:deb/ubuntu/libhtml-formhandler-perl@0.40068-2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.40068-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-formhandler-perl",
            "binary_version": "0.40068-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libhtml-formhandler-perl",
        "purl": "pkg:deb/ubuntu/libhtml-formhandler-perl@0.40068-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.40068-2"
      ]
    }
  ],
  "aliases": [],
  "details": "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\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. 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\u0027s own escaping template layer rather than the library\u0027s 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\u0027s origin. Re-rendering a rejected value later gives the stored variant.",
  "id": "UBUNTU-CVE-2026-19872",
  "modified": "2026-09-16T11:31:18Z",
  "published": "2026-09-08T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-19872"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-19872"
    },
    {
      "type": "REPORT",
      "url": "https://lists.security.metacpan.org/cve-announce/msg/43387502/"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-19872"
  ]
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-19872 (GCVE-0-2026-19872)

FKIE_CVE-2026-19872

GHSA-74PJ-VP7J-2F6M

OPENSUSE-SU-2026:11745-1

UBUNTU-CVE-2026-19872 (CVE-2026-19872)

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Nomenclature

Vulnerability timeline

Related by attack behaviour