{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-8106", "assignerOrgId": "82327ea3-741d-41e4-88f8-2cf9e791e760", "state": "PUBLISHED", "assignerShortName": "GitHub_P", "dateReserved": "2026-05-07T14:46:18.902Z", "datePublished": "2026-05-07T21:18:59.259Z", "dateUpdated": "2026-05-08T13:07:33.764Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "82327ea3-741d-41e4-88f8-2cf9e791e760", "shortName": "GitHub_P", "dateUpdated": "2026-05-07T21:18:59.259Z"}, "title": "Reflected HTML injection vulnerability in GitHub Enterprise Server Management Console login page allowed credential theft", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-243", "descriptions": [{"lang": "en", "value": "CAPEC-243 XSS Targeting HTML Attributes"}]}], "affected": [{"vendor": "GitHub", "product": "Enterprise Server", "versions": [{"status": "affected", "version": "3.19.1", "lessThanOrEqual": "3.19.5", "changes": [{"at": "3.19.6", "status": "unaffected"}], "versionType": "semver"}, {"status": "affected", "version": "3.20.0", "lessThanOrEqual": "3.20.1", "changes": [{"at": "3.20.2", "status": "unaffected"}], "versionType": "semver"}, {"status": "unaffected", "version": "3.19.0", "versionType": "semver"}, {"status": "unaffected", "version": "3.21.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter their credentials. This vulnerability affected GitHub Enterprise Server versions 3.19.1 through 3.19.5 and 3.20.0 through 3.20.1, and was fixed in versions 3.19.6 and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter their credentials. This vulnerability affected GitHub Enterprise Server versions 3.19.1 through 3.19.5 and 3.20.0 through 3.20.1, and was fixed in versions 3.19.6 and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.<br><br>"}]}], "references": [{"url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.6", "tags": ["release-notes"]}, {"url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.2", "tags": ["release-notes"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "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": 5.9, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "maksyche", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-08T13:07:24.192705Z", "id": "CVE-2026-8106", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-08T13:07:33.764Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-8106", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-08T13:07:24.192705Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-08T13:07:29.475Z"}}], "cna": {"title": "Reflected HTML injection vulnerability in GitHub Enterprise Server Management Console login page allowed credential theft", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "maksyche"}], "impacts": [{"capecId": "CAPEC-243", "descriptions": [{"lang": "en", "value": "CAPEC-243 XSS Targeting HTML Attributes"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 5.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "GitHub", "product": "Enterprise Server", "versions": [{"status": "affected", "changes": [{"at": "3.19.6", "status": "unaffected"}], "version": "3.19.1", "versionType": "semver", "lessThanOrEqual": "3.19.5"}, {"status": "affected", "changes": [{"at": "3.20.2", "status": "unaffected"}], "version": "3.20.0", "versionType": "semver", "lessThanOrEqual": "3.20.1"}, {"status": "unaffected", "version": "3.19.0", "versionType": "semver"}, {"status": "unaffected", "version": "3.21.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.6", "tags": ["release-notes"]}, {"url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.2", "tags": ["release-notes"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter their credentials. This vulnerability affected GitHub Enterprise Server versions 3.19.1 through 3.19.5 and 3.20.0 through 3.20.1, and was fixed in versions 3.19.6 and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.", "supportingMedia": [{"type": "text/html", "value": "A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter their credentials. This vulnerability affected GitHub Enterprise Server versions 3.19.1 through 3.19.5 and 3.20.0 through 3.20.1, and was fixed in versions 3.19.6 and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.<br><br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "providerMetadata": {"orgId": "82327ea3-741d-41e4-88f8-2cf9e791e760", "shortName": "GitHub_P", "dateUpdated": "2026-05-07T21:18:59.259Z"}}}, "cveMetadata": {"cveId": "CVE-2026-8106", "state": "PUBLISHED", "dateUpdated": "2026-05-08T13:07:33.764Z", "dateReserved": "2026-05-07T14:46:18.902Z", "assignerOrgId": "82327ea3-741d-41e4-88f8-2cf9e791e760", "datePublished": "2026-05-07T21:18:59.259Z", "assignerShortName": "GitHub_P"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "F71305E0-C008-45FF-8EDC-46D14F07DD51", "versionEndExcluding": "3.19.6", "versionStartIncluding": "3.19.1", "vulnerable": true}, {"criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "FC8A09E8-5FFE-43F1-BC1A-14A298264D80", "versionEndExcluding": "3.20.2", "versionStartIncluding": "3.20.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter their credentials. This vulnerability affected GitHub Enterprise Server versions 3.19.1 through 3.19.5 and 3.20.0 through 3.20.1, and was fixed in versions 3.19.6 and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program."}], "id": "CVE-2026-8106", "lastModified": "2026-05-11T17:12:47.430", "metrics": {"cvssMetricV31": [{"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"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "product-cna@github.com", "type": "Secondary"}]}, "published": "2026-05-07T22:16:37.377", "references": [{"source": "product-cna@github.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.6"}, {"source": "product-cna@github.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.2"}], "sourceIdentifier": "product-cna@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "product-cna@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.19.1,3.19.5]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.20.0,3.20.1]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "3.19.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "3.21.0"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Enterprise Server", "source": "cna", "vendor": "GitHub"}, "product": "enterprise_server", "vendor": "github"}], "created": "2026-05-07T22:30:35.824142+00:00", "updated": "2026-05-07T22:30:36.242615+00:00", "vendors": ["github", "github$PRODUCT$enterprise_server"]}