CVE-2026-4296

{"id": "CVE-2026-4296", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4296", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-04-22T13:16:42.627751Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "product-cna@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.5, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "PASSIVE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "product-cna@github.com", "affectedData": [{"vendor": "GitHub", "product": "Enterprise Server", "versions": [{"status": "affected", "changes": [{"at": "3.14.26", "status": "unaffected"}], "version": "3.14.0", "versionType": "semver", "lessThanOrEqual": "3.14.25"}, {"status": "affected", "changes": [{"at": "3.15.21", "status": "unaffected"}], "version": "3.15.0", "versionType": "semver", "lessThanOrEqual": "3.15.20"}, {"status": "affected", "changes": [{"at": "3.16.17", "status": "unaffected"}], "version": "3.16.0", "versionType": "semver", "lessThanOrEqual": "3.16.16"}, {"status": "affected", "changes": [{"at": "3.17.14", "status": "unaffected"}], "version": "3.17.0", "versionType": "semver", "lessThanOrEqual": "3.17.13"}, {"status": "affected", "changes": [{"at": "3.18.8", "status": "unaffected"}], "version": "3.18.0", "versionType": "semver", "lessThanOrEqual": "3.18.7"}, {"status": "affected", "changes": [{"at": "3.19.5", "status": "unaffected"}], "version": "3.19.0", "versionType": "semver", "lessThanOrEqual": "3.19.4"}, {"status": "affected", "changes": [{"at": "3.20.1", "status": "unaffected"}], "version": "3.20.0", "lessThan": "3.20.1", "versionType": "semver"}], "defaultStatus": "affected"}]}], "published": "2026-04-21T23:16:21.807", "references": [{"url": "https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-cna@github.com"}, {"url": "https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-cna@github.com"}, {"url": "https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-cna@github.com"}, {"url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-cna@github.com"}, {"url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-cna@github.com"}, {"url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-cna@github.com"}, {"url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-cna@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "product-cna@github.com", "description": [{"lang": "en", "value": "CWE-185"}]}], "descriptions": [{"lang": "en", "value": "An incorrect regular expression vulnerability was identified in GitHub Enterprise Server that allowed an attacker to bypass OAuth redirect URI validation. An attacker with knowledge of a first-party OAuth application's registered callback URL could craft a malicious authorization link that, when clicked by a victim, would redirect the OAuth authorization code to an attacker-controlled domain. This could allow the attacker to gain unauthorized access to the victim's account with the scopes granted to the OAuth application. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program."}, {"lang": "es", "value": "Una vulnerabilidad de expresi\u00f3n regular incorrecta fue identificada en GitHub Enterprise Server que permit\u00eda a un atacante eludir la validaci\u00f3n de URI de redirecci\u00f3n de OAuth. Un atacante con conocimiento de la URL de devoluci\u00f3n de llamada registrada de una aplicaci\u00f3n OAuth de primera parte podr\u00eda crear un enlace de autorizaci\u00f3n malicioso que, al ser clicado por una v\u00edctima, redirigir\u00eda el c\u00f3digo de autorizaci\u00f3n de OAuth a un dominio controlado por el atacante. Esto podr\u00eda permitir al atacante obtener acceso no autorizado a la cuenta de la v\u00edctima con los alcances concedidos a la aplicaci\u00f3n OAuth. Esta vulnerabilidad afect\u00f3 a todas las versiones de GitHub Enterprise Server anteriores a la 3.21 y fue corregida en las versiones 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, 3.14.26. Esta vulnerabilidad fue reportada a trav\u00e9s del programa GitHub Bug Bounty."}], "lastModified": "2026-10-26T22:10:00.163", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "72A92258-9FCC-41E0-856B-3C2A495575A6", "versionEndExcluding": "3.14.26"}, {"criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3A14A459-881C-437A-88EC-D721E3005329", "versionEndExcluding": "3.15.21", "versionStartIncluding": "3.15.0"}, {"criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8B7DCD9A-2CF0-4D96-AA96-ACEC662A8E1F", "versionEndExcluding": "3.16.17", "versionStartIncluding": "3.16.0"}, {"criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CEC2ADE6-3E31-4889-9A73-B6695FE0AB52", "versionEndExcluding": "3.17.14", "versionStartIncluding": "3.17.0"}, {"criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9B15B12E-00A8-48E8-81DE-54506B94A2C5", "versionEndExcluding": "3.18.8", "versionStartIncluding": "3.18.0"}, {"criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "56903EAF-4579-4263-AB0F-863323E7C81A", "versionEndExcluding": "3.19.5", "versionStartIncluding": "3.19.0"}, {"criteria": "cpe:2.3:a:github:enterprise_server:3.20.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DCA4F97D-688E-45D2-90C0-8A11E9B531AA"}], "operator": "OR"}]}], "sourceIdentifier": "product-cna@github.com"}