CVE-2026-91766
Cross-origin credential leak in HTTP stream wrapper redirects
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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 ).
| CWE | CWE-200 CWE-522 |
| Vendor | php group |
| Product | php |
| Published | Sep 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
PHP Group / PHP
8.2.* < 8.2.34 8.3.* < 8.3.35 8.4.* < 8.4.26 8.5.* < 8.5.11
References
Credits
🔍 @q2a3z (GitHub) 🔍 Ilia Alshanetsky Alexandre Daubois Tim Düsterhus Arnaud Le Blanc Jakub Zelenka