CVE-2026-91766
Cross-origin credential leak in HTTP stream wrapper redirects
- State
- Published
- Severity
- 5.9 Medium
- Published
- Sep 25, 2026
- Updated
- Sep 28, 2026
- Reserved
- Sep 15, 2026
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 ).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.9 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N | php |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
PHPPHP Group |
|
References
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