Cross-origin credential leak in HTTP stream wrapper redirects

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-91766
StatePUBLISHED
Assignerphp
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 21:17:24 UTC
Updated2026-09-25 21:17:24 UTC
DescriptionWhen 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 ).

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-200 | CWE-522 | CWE-200 CWE-200 | CWE-522 CWE-522

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNACVSS5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA PHP Group PHP affected 8.2.* 8.2.34 semver Not specified
CNA PHP Group PHP affected 8.3.* 8.3.35 semver Not specified
CNA PHP Group PHP affected 8.4.* 8.4.26 semver Not specified
CNA PHP Group PHP affected 8.5.* 8.5.11 semver Not specified

References

ReferenceSourceLinkTags
github.com/php/php-src/security/advisories/GHSA-fpwc-w8rq-cr92 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: @q2a3z (GitHub) (en)

CNA: Ilia Alshanetsky (en)

CNA: Alexandre Daubois (en)

CNA: Tim Düsterhus (en)

CNA: Arnaud Le Blanc (en)

CNA: Jakub Zelenka (en)

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