CVE-2021-35955

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*", "matchCriteriaId": "050530D4-3934-4F6B-B4CD-0FA871B16FBA", "versionEndExcluding": "4.4.56", "versionStartIncluding": "4.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*", "matchCriteriaId": "86916B26-65B1-4557-95C9-03A62F1A3216", "versionEndExcluding": "4.9.18", "versionStartIncluding": "4.5.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*", "matchCriteriaId": "8E05FE29-4CB5-47D9-935B-48A560D9E50D", "versionEndExcluding": "4.11.7", "versionStartIncluding": "4.10.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Contao >=4.0.0 allows backend XSS via HTML attributes to an HTML field. Fixed in 4.4.56, 4.9.18, 4.11.7."}, {"lang": "es", "value": "Contao versiones posteriores a 4.0.0 incluy\u00e9ndola, permite un ataque de tipo XSS de backend por medio de atributos HTML a un campo HTML. Corregido en versiones 4.4.56, 4.9.18, 4.11.7"}], "id": "CVE-2021-35955", "lastModified": "2026-06-17T03:58:01.780", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 3.5, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 6.8, "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": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.7, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-08-12T15:15:07.960", "references": [{"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://contao.org/en/news/contao-4-9-16-and-4-11-5-are-available.html"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://github.com/contao/contao/security/advisories/GHSA-hr3h-x6gq-rqcp"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://contao.org/en/news/contao-4-9-16-and-4-11-5-are-available.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/contao/contao/security/advisories/GHSA-hr3h-x6gq-rqcp"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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