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Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2026-91766

MEDIUM 5.9 CVSS 3.1
Published
September 25, 2026
Last modified
October 23, 2026
NVD status
Analyzed
Reported by
security@php.net
Weakness
CWE-200, CWE-522
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

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 ).

Affected products and versions

  • PHP — From 8.2.0 (including) to 8.2.34 (excluding)
  • PHP — From 8.3.0 (including) to 8.3.35 (excluding)
  • PHP — From 8.4.0 (including) to 8.4.26 (excluding)
  • PHP — From 8.5.0 (including) to 8.5.11 (excluding)

References

  • github.com https://github.com/php/php-src/security/advisories/GHSA-fpwc-w8rq-cr92 Vendor Advisory, Exploit
  • nvd.nist.gov Official NVD record