{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-13T19:03:42.683","vulnerabilities":[{"cve":{"id":"CVE-2021-39197","sourceIdentifier":"security-advisories@github.com","published":"2021-09-07T18:15:07.473","lastModified":"2024-11-21T06:18:52.210","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"better_errors is an open source replacement for the standard Rails error page with more information rich error pages. It is also usable outside of Rails in any Rack app as Rack middleware. better_errors prior to 2.8.0 did not implement CSRF protection for its internal requests. It also did not enforce the correct \"Content-Type\" header for these requests, which allowed a cross-origin \"simple request\" to be made without CORS protection. These together left an application with better_errors enabled open to cross-origin attacks. As a developer tool, better_errors documentation strongly recommends addition only to the `development` bundle group, so this vulnerability should only affect development environments. Please ensure that your project limits better_errors to the `development` group (or the non-Rails equivalent). Starting with release 2.8.x, CSRF protection is enforced. It is recommended that you upgrade to the latest release, or minimally to \"~> 2.8.3\". There are no known workarounds to mitigate the risk of using older releases of better_errors."},{"lang":"es","value":"better_errors es un reemplazo de código abierto para la página de error estándar de Rails con páginas de error más ricas en información. También puede ser usado fuera de Rails en cualquier aplicación Rack como middleware Rack. better_errors versiones anteriores a 2.8.0, no implementaba la protección CSRF para sus peticiones internas. Tampoco aplicaba la cabecera \"Content-Type\" correcta para estas peticiones, que permitía realizar una \"petición simple\" de origen cruzado sin protección CORS. Todo esto dejaba una aplicación con better_errors habilitado abierta a ataques de origen cruzado. Como herramienta para desarrolladores, la documentación de better_errors recomienda encarecidamente que se añada sólo al grupo de paquetes \"development\", por lo que esta vulnerabilidad sólo debería afectar a los entornos de desarrollo. Por favor, asegúrese de que su proyecto limita better_errors al grupo \"development\" (o su equivalente no Rails). A partir de la versión 2.8.x, se aplica la protección CSRF. Se recomienda actualizar a la última versión, o como mínimo a \" versiones posteriores a 2.8.3\". No se presentan soluciones conocidas para mitigar el riesgo de usar versiones anteriores de better_errors"}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","baseScore":6.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":1.8,"impactScore":4.0},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:P","baseScore":6.8,"accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"},"baseSeverity":"MEDIUM","exploitabilityScore":8.6,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-352"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:better_errors_project:better_errors:*:*:*:*:*:ruby:*:*","versionEndExcluding":"2.8.0","matchCriteriaId":"82B32E86-42A3-4E3A-819D-BB3E0A2AEA7D"}]}]}],"references":[{"url":"https://github.com/BetterErrors/better_errors/commit/8e8e796bfbde4aa088741823c8a3fc6df2089bb0","source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/BetterErrors/better_errors/discussions/507","source":"security-advisories@github.com","tags":["Third Party Advisory"]},{"url":"https://github.com/BetterErrors/better_errors/pull/474","source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/BetterErrors/better_errors/security/advisories/GHSA-w3j4-76qw-wwjm","source":"security-advisories@github.com","tags":["Third Party Advisory"]},{"url":"https://github.com/BetterErrors/better_errors/commit/8e8e796bfbde4aa088741823c8a3fc6df2089bb0","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/BetterErrors/better_errors/discussions/507","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"]},{"url":"https://github.com/BetterErrors/better_errors/pull/474","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/BetterErrors/better_errors/security/advisories/GHSA-w3j4-76qw-wwjm","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"]}]}}]}