{"id":"CVE-2026-19872","aliases":["DEBIAN-CVE-2026-19872","EUVD-2026-74166","GHSA-74pj-vp7j-2f6m","UBUNTU-CVE-2026-19872","openSUSE-SU-2026:11745-1"],"status":"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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00327,"percentile":0.26021,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-09-08T20:08:21Z","modified":"2026-10-28T02:30:23Z","fixes":[{"ecosystem":"Debian:14","package":"libhtml-formhandler-perl","fixed_in":["0.410002-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.40068-2","0.40068-3","0.410002-1"]},{"source":"osv","ecosystem":"Debian:13","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.40068-2","0.40068-3","0.410002-1"]},{"source":"osv","ecosystem":"Debian:14","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.410002-1"}]}],"versions":["0.40068-2","0.40068-3"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.40057-1","0.40064-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.40067-1","0.40068-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.40068-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.40068-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.40068-2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.40068-2","0.40068-3"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"libhtml-formhandler-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.40068-2"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"perl-HTML-FormHandler","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.410.2-1.1"}]}],"bundled":5}],"references":[{"url":"https://github.com/gshank/html-formhandler/commit/2574fdb4561f5c32d44cfbfbb3188345d49eb5a2.patch","tags":["patch","fix"]},{"url":"https://metacpan.org/release/ABRAXXA/HTML-FormHandler-0.410000/changes","tags":["release-notes","advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2026/09/08/15","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19872","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-74pj-vp7j-2f6m"},{"url":"https://cpan.org/modules","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19872.json","tags":["advisory"]},{"url":"https://github.com/gshank/html-formhandler","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-19872","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-19872","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-19872","tags":["report"]},{"url":"https://lists.security.metacpan.org/cve-announce/msg/43387502/","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2022-4993","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-19872","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-85484","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-85485","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-85630","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-19872","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.","status":"published","published":"2026-09-08T20:08:21.896Z","modified":"2026-09-10T17:51:23.851Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:47:17.512524Z"}],"euvd":[{"id":"EUVD-2026-74166","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.","status":"published","published":"2026-09-08T20:08:21Z","modified":"2026-09-10T17:51:23Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T17:28:23.831795Z"}],"ghsa":[{"id":"GHSA-74pj-vp7j-2f6m","title":"HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted...","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.","status":"published","published":"2026-09-08T21:34:20Z","modified":"2026-09-10T18:33:07Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:11:43.240477Z"}],"nvd":[{"id":"CVE-2026-19872","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.","status":"published","published":"2026-09-08T20:17:29.85Z","modified":"2026-09-10T18:17:58.827Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:45.264578Z"}],"osv":[{"id":"CVE-2026-19872","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.","status":"published","published":"2026-09-08T20:08:21.896Z","modified":"2026-10-28T02:30:23.378581842Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:44:58.024074Z"},{"id":"DEBIAN-CVE-2026-19872","description":"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.","status":"published","published":"2026-09-08T20:17:29.85Z","modified":"2026-10-01T03:02:57.324636768Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:53.097669Z"},{"id":"UBUNTU-CVE-2026-19872","description":"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.","status":"published","published":"2026-09-08T20:17:00Z","modified":"2026-10-17T12:58:47.109600736Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:01.334185Z"},{"id":"openSUSE-SU-2026:11745-1","title":"perl-HTML-FormHandler-0.410.2-1.1 on GA media","description":"These are all security issues fixed in the perl-HTML-FormHandler-0.410.2-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-10T00:00:00Z","modified":"2026-09-11T18:23:08.001993446Z","updated_at":"2026-11-02T16:58:39.516824Z"}]}}