{"api_version":"1","generated_at":"2026-05-11T18:49:39+00:00","cve":"CVE-2021-4296","urls":{"html":"https://cve.report/CVE-2021-4296","api":"https://cve.report/api/cve/CVE-2021-4296.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-4296","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-4296"},"summary":{"title":"CVE-2021-4296","description":"A vulnerability, which was classified as problematic, has been found in w3c Unicorn. This issue affects the function ValidatorNuMessage of the file src/org/w3c/unicorn/response/impl/ValidatorNuMessage.java. The manipulation of the argument message leads to cross site scripting. The attack may be initiated remotely. The name of the patch is 51f75c31f7fc33859a9a571311c67ae4e95d9c68. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-217019.","state":"PUBLIC","assigner":"cna@vuldb.com","published_at":"2022-12-29 09:15:00","updated_at":"2023-11-07 03:40:00"},"problem_types":["CWE-79"],"metrics":[],"references":[{"url":"https://github.com/w3c/Unicorn/commit/51f75c31f7fc33859a9a571311c67ae4e95d9c68","name":"https://github.com/w3c/Unicorn/commit/51f75c31f7fc33859a9a571311c67ae4e95d9c68","refsource":"MISC","tags":[],"title":"Merge pull request #212 from w3c/nu-xss · w3c/Unicorn@51f75c3 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://vuldb.com/?ctiid.217019","name":"https://vuldb.com/?ctiid.217019","refsource":"MISC","tags":[],"title":"CVE-2021-4296 | w3c Unicorn ValidatorNuMessage.java ValidatorNuMessage cross site scripting (ID 212)","mime":"text/html","httpstatus":"429","archivestatus":"404"},{"url":"https://vuldb.com/?id.217019","name":"https://vuldb.com/?id.217019","refsource":"MISC","tags":[],"title":"CVE-2021-4296 | w3c Unicorn ValidatorNuMessage.java ValidatorNuMessage cross site scripting (ID 212)","mime":"text/html","httpstatus":"429","archivestatus":"404"},{"url":"https://github.com/w3c/Unicorn/pull/212","name":"https://github.com/w3c/Unicorn/pull/212","refsource":"MISC","tags":[],"title":"Escape HTML in messages extracted from Validator NU output by dontcallmedom · Pull Request #212 · w3c/Unicorn · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-4296","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-4296","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"4296","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"w3","cpe5":"unicorn","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"data_version":"4.0","data_type":"CVE","data_format":"MITRE","CVE_data_meta":{"ID":"CVE-2021-4296","ASSIGNER":"cna@vuldb.com","STATE":"PUBLIC"},"description":{"description_data":[{"lang":"eng","value":"A vulnerability, which was classified as problematic, has been found in w3c Unicorn. This issue affects the function ValidatorNuMessage of the file src/org/w3c/unicorn/response/impl/ValidatorNuMessage.java. The manipulation of the argument message leads to cross site scripting. The attack may be initiated remotely. The name of the patch is 51f75c31f7fc33859a9a571311c67ae4e95d9c68. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-217019."},{"lang":"deu","value":"Eine Schwachstelle wurde in w3c Unicorn entdeckt. Sie wurde als problematisch eingestuft. Hierbei geht es um die Funktion ValidatorNuMessage der Datei src/org/w3c/unicorn/response/impl/ValidatorNuMessage.java. Dank der Manipulation des Arguments message mit unbekannten Daten kann eine cross site scripting-Schwachstelle ausgenutzt werden. Umgesetzt werden kann der Angriff über das Netzwerk. Der Patch wird als 51f75c31f7fc33859a9a571311c67ae4e95d9c68 bezeichnet. Als bestmögliche Massnahme wird Patching empfohlen."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-79 Cross Site Scripting","cweId":"CWE-79"}]}]},"affects":{"vendor":{"vendor_data":[{"vendor_name":"w3c","product":{"product_data":[{"product_name":"Unicorn","version":{"version_data":[{"version_value":"n/a","version_affected":"="}]}}]}}]}},"references":{"reference_data":[{"url":"https://vuldb.com/?id.217019","refsource":"MISC","name":"https://vuldb.com/?id.217019"},{"url":"https://vuldb.com/?ctiid.217019","refsource":"MISC","name":"https://vuldb.com/?ctiid.217019"},{"url":"https://github.com/w3c/Unicorn/pull/212","refsource":"MISC","name":"https://github.com/w3c/Unicorn/pull/212"},{"url":"https://github.com/w3c/Unicorn/commit/51f75c31f7fc33859a9a571311c67ae4e95d9c68","refsource":"MISC","name":"https://github.com/w3c/Unicorn/commit/51f75c31f7fc33859a9a571311c67ae4e95d9c68"}]},"credits":[{"lang":"en","value":"VulDB GitHub Commit Analyzer"}],"impact":{"cvss":[{"version":"3.1","baseScore":3.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","baseSeverity":"LOW"},{"version":"3.0","baseScore":3.5,"vectorString":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","baseSeverity":"LOW"}]}},"nvd":{"publishedDate":"2022-12-29 09:15:00","lastModifiedDate":"2023-11-07 03:40:00","problem_types":["CWE-79"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":2.7}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:w3:unicorn:*:*:*:*:*:*:*:*","versionEndExcluding":"2021-06-03","cpe_name":[]}]}]}},"legacy_mitre":{"record":null,"notes":[]}}}