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fix(HTTP): prevent false positive header matches in Cors::hasResponseHeaders() - #10731

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gr8man wants to merge 1 commit into
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gr8man:fix/cors-has-response-headers
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gr8man wants to merge 1 commit into
codeigniter4:developfrom
gr8man:fix/cors-has-response-headers

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@gr8man

@gr8man gr8man commented Nov 5, 2026

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Description
Cors::hasResponseHeaders() used str_contains() to check for exposed headers, which produced false positives when an existing header was a prefix/substring of the configured header (e.g. X-Custom matched in X-Custom-Header). It now parses the header list and performs exact, case-insensitive comparisons for each configured header.

Checklist:

  • Securely signed commits
  • Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
  • Unit testing, with >80% coverage
  • User guide updated
  • Conforms to style guide

@carson-codeigniter4 carson-codeigniter4 Bot added the bug Verified issues on the current code behavior or pull requests that will fix them label Nov 5, 2026
@gr8man
gr8man force-pushed the fix/cors-has-response-headers branch from d5df9b7 to 3b1860e Compare November 5, 2026 20:31

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