CVE-2021-41095

{"containers": {"cna": {"affected": [{"product": "discourse", "vendor": "discourse", "versions": [{"status": "affected", "version": "<= 2.7.7"}, {"status": "affected", "version": ">= 2.8.0.beta1, <= 2.8.0.beta6"}]}], "descriptions": [{"lang": "en", "value": "Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the `stable` branch, versions 2.8.0.beta6 and earlier of the `beta` branch, and versions 2.8.0.beta6 and earlier of the `tests-passed` branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable`, `beta` and `tests-passed` versions of Discourse. As a workaround, avoid modifying or disabling Discourse\u2019s default Content Security Policy, and blocking watched words containing HTML tags."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/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": "2021-09-27T19:30:11.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59"}], "source": {"advisory": "GHSA-qvqx-2h7w-m479", "discovery": "UNKNOWN"}, "title": "XSS via blocked watched word in error message", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-41095", "STATE": "PUBLIC", "TITLE": "XSS via blocked watched word in error message"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "discourse", "version": {"version_data": [{"version_value": "<= 2.7.7"}, {"version_value": ">= 2.8.0.beta1, <= 2.8.0.beta6"}]}}]}, "vendor_name": "discourse"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the `stable` branch, versions 2.8.0.beta6 and earlier of the `beta` branch, and versions 2.8.0.beta6 and earlier of the `tests-passed` branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable`, `beta` and `tests-passed` versions of Discourse. As a workaround, avoid modifying or disabling Discourse\u2019s default Content Security Policy, and blocking watched words containing HTML tags."}]}, "impact": {"cvss": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/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/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479", "refsource": "CONFIRM", "url": "https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479"}, {"name": "https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59", "refsource": "MISC", "url": "https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59"}]}, "source": {"advisory": "GHSA-qvqx-2h7w-m479", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T02:59:31.377Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-41095", "datePublished": "2021-09-27T19:30:11.000Z", "dateReserved": "2021-09-15T00:00:00.000Z", "dateUpdated": "2024-08-04T02:59:31.377Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "discourse", "vendor": "discourse", "versions": [{"status": "affected", "version": "<= 2.7.7"}, {"status": "affected", "version": ">= 2.8.0.beta1, <= 2.8.0.beta6"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "matchCriteriaId": "19C1E690-4B7F-46DC-8CB2-5335F98F4020", "versionEndIncluding": "2.7.7", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:2.8.0:beta1:*:*:*:*:*:*", "matchCriteriaId": "9E7F8AC4-35D1-45E5-8A3A-B0205000A5D3", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:2.8.0:beta2:*:*:*:*:*:*", "matchCriteriaId": "B9AE12FE-0396-4843-8D30-D8C44FAE01DA", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:2.8.0:beta3:*:*:*:*:*:*", "matchCriteriaId": "F101AEAB-4FB7-4BE3-931B-595702D616C7", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:2.8.0:beta4:*:*:*:*:*:*", "matchCriteriaId": "F6878B7F-2691-4D3F-8116-CB282FDAAAC7", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:2.8.0:beta5:*:*:*:*:*:*", "matchCriteriaId": "76EABAB9-BEA4-48D4-ADBA-D00746B29C52", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:2.8.0:beta6:*:*:*:*:*:*", "matchCriteriaId": "82A255A2-4658-41AD-A4DE-A7F8D018028D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the `stable` branch, versions 2.8.0.beta6 and earlier of the `beta` branch, and versions 2.8.0.beta6 and earlier of the `tests-passed` branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable`, `beta` and `tests-passed` versions of Discourse. As a workaround, avoid modifying or disabling Discourse\u2019s default Content Security Policy, and blocking watched words containing HTML tags."}, {"lang": "es", "value": "Discourse es una plataforma de debate de c\u00f3digo abierto. Se presenta una vulnerabilidad de tipo cross-site scripting (XSS) en versiones 2.7.7 y anteriores de la rama \"stable\", en las versiones 2.8.0.beta6 y anteriores de la rama \"beta\", y en las versiones 2.8.0.beta6 y anteriores de la rama \"tests-passed\". La representaci\u00f3n de algunos mensajes de error que contienen entradas del usuario puede ser susceptible de ataques de tipo XSS. Esta vulnerabilidad s\u00f3lo afecta a los sitios que han bloqueado las palabras vigiladas que contienen etiquetas HTML, han modificado o han deshabilitado la pol\u00edtica de seguridad de contenidos predeterminada de Discourse. Este problema est\u00e1 parcheado en las \u00faltimas versiones \"stable\", \"beta\" y \"tests-passed\" de Discourse. Como soluci\u00f3n, evite la modificar o desactivar la pol\u00edtica de seguridad de contenidos predeterminada de Discourse y bloquear las palabras vigiladas que contengan etiquetas HTML"}], "id": "CVE-2021-41095", "lastModified": "2026-06-17T04:07:51.933", "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": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 2.5, "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": "2021-09-27T20:15:07.267", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479"}], "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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