{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-107147", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "state": "PUBLISHED", "assignerShortName": "CERT-PL", "dateReserved": "2026-10-07T08:44:03.177Z", "datePublished": "2026-10-27T09:36:01.938Z", "dateUpdated": "2026-10-27T09:36:01.938Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-10-27T09:36:01.938Z"}, "title": "Authentication bypass by spoofing in twofactor_gauthenticator", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-290", "description": "CWE-290 Authentication bypass by spoofing", "type": "CWE"}]}], "affected": [{"vendor": "alexandregz", "product": "twofactor_gauthenticator", "collectionURL": "https://github.com", "repo": "https://github.com/alexandregz/twofactor_gauthenticator", "versions": [{"status": "affected", "version": "0", "lessThan": "4640889", "versionType": "git"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:alexandregz:twofactor_gauthenticator:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndExcluding": "4640889"}]}]}], "descriptions": [{"lang": "en", "value": "The twofactor_gauthenticator plugin for Roundcube is vulnerable to 2fa authentication bypass by spoofed client address headers. Due to the lack of validation of the Client-IP and X-Forwarded-For\u00a0headers, an attacker\u00a0who obtains user's password can spoof a whitelisted IP address, resulting in the second factor being bypassed.\n\n\n\n\nThis issue was fixed in commit 4640889.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div>The twofactor_gauthenticator plugin for Roundcube is vulnerable to 2fa authentication bypass by spoofed client address headers. Due to the lack of validation of the Client-IP and X-Forwarded-For&nbsp;headers, an attacker&nbsp;who obtains user's password can spoof a whitelisted IP address, resulting in the second factor being bypassed.</div><div><br></div>This issue was fixed in commit 4640889."}]}], "tags": ["x_open-source"], "references": [{"url": "https://cert.pl/en/posts/2026/10/CVE-2026-107145", "tags": ["third-party-advisory"]}, {"url": "https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.md", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.3, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "Marek Figielski (Vanilla.pl)", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.3"}}}}

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{"created": "2026-10-27T10:30:11.090114+00:00", "updated": "2026-10-27T10:30:11.090118+00:00", "vendors": []}