{"id":"CVE-2026-19872","state":"PUBLISHED","title":"HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted value rendered unescaped in an error message","description":"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.","publishedAt":"2026-09-08T20:08:21.896Z","updatedAt":"2026-09-10T17:51:23.851Z","severity":{"score":6.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","source":"CISA-ADP"},"assigner":"CPANSec","products":["HTML-FormHandler"],"affected":[{"packageName":"HTML-FormHandler","packageURL":"pkg:cpan/HTML-FormHandler","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.410000","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","modules":["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"}],"references":["https://github.com/gshank/html-formhandler/commit/2574fdb4561f5c32d44cfbfbb3188345d49eb5a2.patch","https://metacpan.org/release/ABRAXXA/HTML-FormHandler-0.410000/changes","http://www.openwall.com/lists/oss-security/2026/09/08/15"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/19xxx/CVE-2026-19872.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-19872","state":"PUBLISHED","datePublished":"2026-09-08T20:08:21.896Z","dateUpdated":"2026-09-10T17:51:23.851Z","assignerShortName":"CPANSec","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateReserved":"2026-08-14T12:49:19.665Z"},"containers":{"cna":{"title":"HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted value rendered unescaped in an error message","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."}],"affected":[{"packageName":"HTML-FormHandler","packageURL":"pkg:cpan/HTML-FormHandler","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.410000","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","modules":["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"}],"references":[{"url":"https://github.com/gshank/html-formhandler/commit/2574fdb4561f5c32d44cfbfbb3188345d49eb5a2.patch","tags":["patch"]},{"url":"https://metacpan.org/release/ABRAXXA/HTML-FormHandler-0.410000/changes","tags":["release-notes"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CPANSec","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateUpdated":"2026-09-08T20:08:21.896Z"},"solutions":[{"lang":"en","value":"Upgrade to HTML-FormHandler 0.410000 or later."}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"cpansec-cna-tool 0.1"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/09/08/15"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-09-08T22:07:16.768Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"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"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-10T17:51:07.811981Z","id":"CVE-2026-19872","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-10T17:51:23.851Z"}}]}}}