{"id":"CVE-2026-91766","title":"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 HT…","summary":"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 HT…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-200","CWE-522"],"vendor":"PHP Group","product":"ext-standard","affected":["ext-standard >= 8.2.* < 8.2.34","ext-standard >= 8.3.* < 8.3.35","ext-standard >= 8.4.* < 8.4.26","ext-standard >= 8.5.* < 8.5.11"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T21:17:24.673","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91766","references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-fpwc-w8rq-cr92","label":"security@php.net"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T21:19:40.146Z","slug":"CVE-2026-91766","body":"## Overview\n\nWhen 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 ).\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}