CVE-2026-27748

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During the update process, a privileged service running as SYSTEM deletes a file under C:\\\\ProgramData without validating whether the path resolves through a symbolic link or reparse point. A local attacker can create a malicious link to redirect the delete operation to an arbitrary file, resulting in deletion of attacker-chosen files with SYSTEM privileges. This may lead to local privilege escalation, denial of service, or system integrity compromise depending on the targeted file and operating system configuration.", "supportingMedia": [{"type": "text/html", "value": "Avira Internet Security contains an improper link resolution vulnerability in the Software Updater component. During the update process, a privileged service running as SYSTEM deletes a file under C:\\\\ProgramData without validating whether the path resolves through a symbolic link or reparse point. A local attacker can create a malicious link to redirect the delete operation to an arbitrary file, resulting in deletion of attacker-chosen files with SYSTEM privileges. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["Windows"], "product": "Avira Internet Security", "vendor": "Gen Digital Inc.", "versions": [{"lessThanOrEqual": "1.1.109.1990", "status": "affected", "version": "0", "versionType": "semver"}, {"status": "unaffected", "version": "1.1.114.3113", "versionType": "semver"}]}], "source": "security@nortonlifelock.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:avira:internet_security:*:*:*:*:*:windows:*:*", "matchCriteriaId": "DFB6EFB7-8777-4A9B-9A00-2FBEE12A7090", "versionEndExcluding": "1.1.114.3113", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Avira Internet Security contains an improper link resolution vulnerability in the Software Updater component. During the update process, a privileged service running as SYSTEM deletes a file under C:\\\\ProgramData without validating whether the path resolves through a symbolic link or reparse point. A local attacker can create a malicious link to redirect the delete operation to an arbitrary file, resulting in deletion of attacker-chosen files with SYSTEM privileges. This may lead to local privilege escalation, denial of service, or system integrity compromise depending on the targeted file and operating system configuration."}, {"lang": "es", "value": "Avira Internet Security contiene una vulnerabilidad de resoluci\u00f3n de enlaces incorrecta en el componente Software Updater. Durante el proceso de actualizaci\u00f3n, un servicio privilegiado ejecut\u00e1ndose como SYSTEM elimina un archivo bajo C:\\\\ProgramData sin validar si la ruta se resuelve a trav\u00e9s de un enlace simb\u00f3lico o un punto de rean\u00e1lisis. Un atacante local puede crear un enlace malicioso para redirigir la operaci\u00f3n de eliminaci\u00f3n a un archivo arbitrario, resultando en la eliminaci\u00f3n de archivos elegidos por el atacante con privilegios de SYSTEM. Esto puede llevar a una escalada de privilegios local, denegaci\u00f3n de servicio o compromiso de la integridad del sistema dependiendo del archivo objetivo y la configuraci\u00f3n del sistema operativo."}], "id": "CVE-2026-27748", "lastModified": "2026-06-17T10:27:37.600", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "security@nortonlifelock.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27748", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-06T18:16:39.759709Z", "version": "2.0.3"}}]}, "published": "2026-03-05T15:16:11.747", "references": [{"source": "security@nortonlifelock.com", "tags": ["Release Notes"], "url": "https://support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versions"}, {"source": "security@nortonlifelock.com", "tags": ["Product"], "url": "https://www.avira.com/en/internet-security"}, {"source": "security@nortonlifelock.com", "url": "https://www.gendigital.com/us/en/contact-us/security-advisories/"}], "sourceIdentifier": "security@nortonlifelock.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-59"}], "source": "security@nortonlifelock.com", "type": "Secondary"}]}

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{"affected": [{"configurations": [{"platform": ["windows"], "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.1.109.1990]"}}, {"platform": ["windows"], "status": "unaffected", "versions": {"scheme": "generic", "value": "[1.1.114.3113,1.1.114.3113]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Avira Internet Security", "source": "cna", "vendor": "Gen Digital Inc."}, "product": "avira_internet_security", "vendor": "gen_digital"}], "analysis": {"en": {"generated_at": "2026-04-15T22:43:30.503877+00:00", "value": {"mitigation_remediation": ["Update Avira Internet Security for Windows to version 1.1.114.3113 or later using the built\u2011in updater or by reinstalling the product. ", "Disable or stop the Software Updater service until the patch is applied to prevent the delete operation from occurring. ", "Audit C:\\ProgramData for suspicious symbolic links or reparse points and remove any that are not necessary for legitimate application operation."], "summary": {"action": "Patch Immediately", "impact": "Local Privilege Escalation and File Deletion"}, "threat_synthesis": {"affected_systems": "All releases of Gen Digital Inc.\u2019s Avira Internet Security Suite and Internet Security for Windows running on Windows before version 1.1.114.3113 are affected. The issue resides in the updater component of these products. Updating to Avira Internet Security for Windows 1.1.114.3113 or later removes the flaw.", "description_and_impact": "Avira Internet Security contains an improper link resolution flaw in its Software Updater component. During an update, a privileged service running as SYSTEM deletes files under C:\\ProgramData without verifying whether the target path is a symbolic link or reparse point. If a local attacker creates a malicious link, the service can delete any file the link points to, effectively allowing the attacker to cause arbitrary file deletion with SYSTEM privileges. This vulnerability can lead to local privilege escalation, denial of service, or compromise of system integrity depending on the file targeted and the system configuration. The weakness is described by CWE-59.", "risk_and_exploitability": "The CVSS score of 7.8 classifies the flaw as high. The EPSS score of less than 1% indicates a low probability of exploitation at present, and the vulnerability is not listed in CISA\u2019s KEV catalog. Exploitation requires local access, with the attacker creating a malicious link and triggering the Software Updater to run. The local privileged nature of the attack means that, once leveraged, the attacker can delete any file at the SYSTEM level, potentially escalating privileges further or corrupting critical system files."}}}}, "created": "2026-03-06T15:07:37.326969+00:00", "updated": "2026-04-15T22:45:16.449040+00:00", "vendors": ["gen_digital", "gen_digital$PRODUCT$avira_internet_security"]}