Bug 2541649 (CVE-2026-91766)

Summary: CVE-2026-91766 php: php: Credential disclosure via cross-origin HTTP redirects
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in PHP. When following a redirect, the built-in HTTP (Hypertext Transfer Protocol) stream wrapper forwards sensitive request headers—such as authentication tokens and session cookies—unchanged, even when directed to a different host, port, or unencrypted connection. A malicious server capable of steering redirects can exploit this flaw to capture sensitive credentials intended only for the original destination.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-25 20:58:31 UTC 
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 ).