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CVE-2026-91766— Cross-origin credential leak in HTTP stream wrapper redirects

Quick assessment

Affected
PHP Group PHP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

当 http:// 流包装器（stream wrapper）跟随重定向时，它会将用户提供的 Authorization、Cookie 和 Proxy-Authorization 头信息原样转发，即使重定向目标指向不同的主机、不同的端口，或者存在从 HTTPS 到 HTTP 的降级情况。因此，能够操控重定向的服务器会接收到原本仅意图发送给原始源站的凭据。此类问题与 libcurl 在版本 7.58.0 中修复的 CVE-2018-1000007（详见 https://github.com/advisories/GHS

CVSS 5.9 · Medium EPSS 0.34% · P25
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I. Basic Information for CVE-2026-91766

Vulnerability Information
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Vulnerability Title
Cross-origin credential leak in HTTP stream wrapper redirects
Source: CVE Program / CVE List V5
Vulnerability Description
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 ).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHP Group PHP 8.2.* ~ 8.2.34 -

II. Public POCs for CVE-2026-91766

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III. Intelligence Information for CVE-2026-91766

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Other References for CVE-2026-91766 (1)

Same Patch Batch · PHP Group · 2026-09-25 · 11 CVEs total

CVE-2026-91765 7.5 HIGH SOAP: Unbounded Recursion in Server-Side cleanup_xml_node
CVE-2026-17545 6.9 MEDIUM PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can ca
CVE-2026-91767 6.5 MEDIUM Heap-buffer-overflow in php_openssl_matches_wildcard_name on crafted server cert wildcard
CVE-2026-91768 6.5 MEDIUM IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcm
CVE-2025-14181 6.5 MEDIUM Integer overflow to buffer overflow in soap HTTP parsing
CVE-2026-92842 5.9 MEDIUM OOB read / info leak in convert.* stream filters when line-break-chars contains NUL
CVE-2026-93682 5.8 MEDIUM Out-of-bounds read in the HTTP stream wrapper when following a redirect with an empty Loca
CVE-2026-6103 4.3 MEDIUM Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection
CVE-2026-91769 4.3 MEDIUM TLS Hostname Verification Falls Back to CN After SAN Mismatch
CVE-2025-1218 3.4 LOW Various packet overreads in mysqlnd_writeprotocol.c

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-200

V. Comments for CVE-2026-91766

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