{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-91766", "assignerOrgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b", "state": "PUBLISHED", "assignerShortName": "php", "dateReserved": "2026-09-15T00:38:24.146Z", "datePublished": "2026-09-25T20:40:25.040Z", "dateUpdated": "2026-09-25T20:40:25.040Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b", "shortName": "php", "dateUpdated": "2026-09-25T20:40:25.040Z"}, "title": "Cross-origin credential leak in HTTP stream wrapper redirects", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-200", "description": "CWE-200", "type": "CWE"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-522", "description": "CWE-522", "type": "CWE"}]}], "impacts": [{"descriptions": [{"lang": "en", "value": "CWE-200"}]}], "affected": [{"vendor": "PHP Group", "product": "PHP", "packageName": "ext-standard", "versions": [{"status": "affected", "version": "8.2.*", "lessThan": "8.2.34", "versionType": "semver"}, {"status": "affected", "version": "8.3.*", "lessThan": "8.3.35", "versionType": "semver"}, {"status": "affected", "version": "8.4.*", "lessThan": "8.4.26", "versionType": "semver"}, {"status": "affected", "version": "8.5.*", "lessThan": "8.5.11", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "When the http:// stream wrapper follows a redirect it forwards the user-supplied Authorization, Cookie and Proxy-Authorization headers unchanged, even when the redirect target is a different host, a different port, or a downgrade from HTTPS to HTTP. A server that can steer a redirect therefore receives credentials that were only meant for the original origin. This is the same class of issue that libcurl fixed in 7.58.0 ( CVE-2018-1000007 https://github.com/advisories/GHSA-g7x2-hrfp-pv5f ).", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>When the <code>http://</code> stream wrapper follows a redirect it forwards the user-supplied <code>Authorization</code>, <code>Cookie</code> and <code>Proxy-Authorization</code> headers unchanged, even when the redirect target is a different host, a different port, or a downgrade from HTTPS to HTTP. A server that can steer a redirect therefore receives credentials that were only meant for the original origin. This is the same class of issue that libcurl fixed in 7.58.0 (<a title=\"CVE-2018-1000007\" href=\"https://github.com/advisories/GHSA-g7x2-hrfp-pv5f\">CVE-2018-1000007</a>).</p>"}]}], "references": [{"url": "https://github.com/php/php-src/security/advisories/GHSA-fpwc-w8rq-cr92", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 5.9, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"}}], "credits": [{"lang": "en", "value": "@q2a3z (GitHub)", "type": "reporter"}, {"lang": "en", "value": "Ilia Alshanetsky", "type": "reporter"}, {"lang": "en", "value": "Alexandre Daubois", "type": "remediation developer"}, {"lang": "en", "value": "Tim D\u00fcsterhus", "type": "remediation reviewer"}, {"lang": "en", "value": "Arnaud Le Blanc", "type": "remediation reviewer"}, {"lang": "en", "value": "Jakub Zelenka", "type": "remediation reviewer"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageName": "ext-standard", "product": "PHP", "vendor": "PHP Group", "versions": [{"lessThan": "8.2.34", "status": "affected", "version": "8.2.*", "versionType": "semver"}, {"lessThan": "8.3.35", "status": "affected", "version": "8.3.*", "versionType": "semver"}, {"lessThan": "8.4.26", "status": "affected", "version": "8.4.*", "versionType": "semver"}, {"lessThan": "8.5.11", "status": "affected", "version": "8.5.*", "versionType": "semver"}]}], "source": "security@php.net"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "When the http:// stream wrapper follows a redirect it forwards the user-supplied Authorization, Cookie and Proxy-Authorization headers unchanged, even when the redirect target is a different host, a different port, or a downgrade from HTTPS to HTTP. A server that can steer a redirect therefore receives credentials that were only meant for the original origin. This is the same class of issue that libcurl fixed in 7.58.0 ( CVE-2018-1000007 https://github.com/advisories/GHSA-g7x2-hrfp-pv5f )."}], "id": "CVE-2026-91766", "lastModified": "2026-09-25T21:17:24.673", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security@php.net", "type": "Secondary"}]}, "published": "2026-09-25T21:17:24.673", "references": [{"source": "security@php.net", "url": "https://github.com/php/php-src/security/advisories/GHSA-fpwc-w8rq-cr92"}], "sourceIdentifier": "security@php.net", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}, {"lang": "en", "value": "CWE-522"}], "source": "security@php.net", "type": "Secondary"}]}

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