CVE-2021-37634

{"containers": {"cna": {"affected": [{"product": "leaf-kit", "vendor": "vapor", "versions": [{"status": "affected", "version": "< 1.3.0"}]}], "descriptions": [{"lang": "en", "value": "Leafkit is a templating language with Swift-inspired syntax. Versions prior to 1.3.0 are susceptible to Cross-site Scripting (XSS) attacks. This affects anyone passing unsanitised data to Leaf's variable tags. Before this fix, Leaf would not escape any strings passed to tags as variables. If an attacker managed to find a variable that was rendered with their unsanitised data, they could inject scripts into a generated Leaf page, which could enable XSS attacks if other mitigations such as a Content Security Policy were not enabled. This has been patched in 1.3.0. As a workaround sanitize any untrusted input before passing it to Leaf and enable a CSP to block inline script and CSS data."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-08-09T19:45:13.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/vapor/leaf-kit/security/advisories/GHSA-rv3x-xq3r-8j9h"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/vapor/leaf-kit-ghsa-rv3x-xq3r-8j9h/pull/1"}], "source": {"advisory": "GHSA-rv3x-xq3r-8j9h", "discovery": "UNKNOWN"}, "title": "LeafKit allows XSS with untrusted user input", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-37634", "STATE": "PUBLIC", "TITLE": "LeafKit allows XSS with untrusted user input"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "leaf-kit", "version": {"version_data": [{"version_value": "< 1.3.0"}]}}]}, "vendor_name": "vapor"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Leafkit is a templating language with Swift-inspired syntax. Versions prior to 1.3.0 are susceptible to Cross-site Scripting (XSS) attacks. This affects anyone passing unsanitised data to Leaf's variable tags. Before this fix, Leaf would not escape any strings passed to tags as variables. If an attacker managed to find a variable that was rendered with their unsanitised data, they could inject scripts into a generated Leaf page, which could enable XSS attacks if other mitigations such as a Content Security Policy were not enabled. This has been patched in 1.3.0. As a workaround sanitize any untrusted input before passing it to Leaf and enable a CSP to block inline script and CSS data."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}]}, "references": {"reference_data": [{"name": "https://github.com/vapor/leaf-kit/security/advisories/GHSA-rv3x-xq3r-8j9h", "refsource": "CONFIRM", "url": "https://github.com/vapor/leaf-kit/security/advisories/GHSA-rv3x-xq3r-8j9h"}, {"name": "https://github.com/vapor/leaf-kit-ghsa-rv3x-xq3r-8j9h/pull/1", "refsource": "MISC", "url": "https://github.com/vapor/leaf-kit-ghsa-rv3x-xq3r-8j9h/pull/1"}]}, "source": {"advisory": "GHSA-rv3x-xq3r-8j9h", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T01:23:01.289Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/vapor/leaf-kit/security/advisories/GHSA-rv3x-xq3r-8j9h"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/vapor/leaf-kit-ghsa-rv3x-xq3r-8j9h/pull/1"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-37634", "datePublished": "2021-08-09T19:45:13.000Z", "dateReserved": "2021-07-29T00:00:00.000Z", "dateUpdated": "2024-08-04T01:23:01.289Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "leaf-kit", "vendor": "vapor", "versions": [{"status": "affected", "version": "< 1.3.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:vapor:leafkit:*:*:*:*:*:*:*:*", "matchCriteriaId": "3A0B80A2-B971-4280-84D6-73AC00134440", "versionEndExcluding": "1.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Leafkit is a templating language with Swift-inspired syntax. Versions prior to 1.3.0 are susceptible to Cross-site Scripting (XSS) attacks. This affects anyone passing unsanitised data to Leaf's variable tags. Before this fix, Leaf would not escape any strings passed to tags as variables. If an attacker managed to find a variable that was rendered with their unsanitised data, they could inject scripts into a generated Leaf page, which could enable XSS attacks if other mitigations such as a Content Security Policy were not enabled. This has been patched in 1.3.0. As a workaround sanitize any untrusted input before passing it to Leaf and enable a CSP to block inline script and CSS data."}, {"lang": "es", "value": "Leafkit es un lenguaje de plantillas con una sintaxis inspirada en Swift. Las versiones anteriores a 1.3.0, son susceptibles de sufrir ataques de tipo Cross-site Scripting (XSS). Esto afecta a cualquiera que pase datos no saneados a las etiquetas variables de Leaf. Antes de esta correcci\u00f3n, Leaf no escapaba las cadenas pasadas a las etiquetas como variables. Si un atacante lograba encontrar una variable que se presentara con sus datos no saneados, pod\u00eda inyectar scripts en una p\u00e1gina de Leaf generada, que pod\u00eda permitir ataques de tipo XSS si no se habilitaban otras mitigaciones como una Pol\u00edtica de Seguridad de Contenidos. Esto ha sido parcheado en versi\u00f3n 1.3.0. Como soluci\u00f3n, sanear cualquier entrada no confiable antes de pasarla a Leaf y habilitar una CSP para bloquear los datos de script y CSS en l\u00ednea"}], "id": "CVE-2021-37634", "lastModified": "2026-06-17T04:00:52.403", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.0, "source": "security-advisories@github.com", "type": "Secondary"}, {"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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-08-09T20:15:07.727", "references": [{"source": "security-advisories@github.com", "tags": ["Broken Link"], "url": "https://github.com/vapor/leaf-kit-ghsa-rv3x-xq3r-8j9h/pull/1"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/vapor/leaf-kit/security/advisories/GHSA-rv3x-xq3r-8j9h"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Broken Link"], "url": "https://github.com/vapor/leaf-kit-ghsa-rv3x-xq3r-8j9h/pull/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/vapor/leaf-kit/security/advisories/GHSA-rv3x-xq3r-8j9h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-79"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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