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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Telerik UI for WinForms", "vendor": "Progress Software", "versions": [{"lessThan": "2026.4.1111", "status": "affected", "version": "2026.3.1007", "versionType": "custom"}]}], "source": "security@progress.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Telerik UI for WinForms, versions prior to 2026.4.1111, an untrusted URL redirection vulnerability exists that allows an attacker to launch arbitrary operating system protocol handlers with attacker-controlled arguments via crafted documents and hyperlinks with a non-allowlisted URI scheme that the user opens."}], "id": "CVE-2026-124700", "lastModified": "2026-11-12T18:17:22.537", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "security@progress.com", "type": "Secondary"}]}, "published": "2026-11-12T18:17:22.537", "references": [{"source": "security@progress.com", "url": "https://www.telerik.com/products/winforms/documentation/knowledge-base/kb-security-untrusted-url-redirection-cve-2026-124700"}], "sourceIdentifier": "security@progress.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-601"}], "source": "security@progress.com", "type": "Primary"}]}

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