fix(Cookie): validate cookie path and domain attributes

[gr8man]

Description
Validates cookie path, domain, and prefix attributes against reserved characters (",; \t\r\n\v\f\0") to prevent CRLF injection in raw cookies and avoid fatal ValueErrors from PHP's native setcookie() and setrawcookie(). Also ensures null attribute options safely fall back to defaults in the constructor.

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

[Copilot]

🟡 Changes recommended

Non-raw prefixes still bypass validation and can cause setcookie() to throw a ValueError.

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Pull request overview

Adds cookie attribute validation to prevent header injection and native PHP ValueErrors. Review assumes the develop base branch.

Changes:

• Validates cookie paths, domains, and prefixes.
• Defaults nullable cookie options safely.
• Adds tests, messages, and documentation.

File summaries

File	Description
system/Cookie/Cookie.php	Implements normalization and validation.
system/Cookie/Exceptions/CookieException.php	Adds validation exceptions.
system/Language/en/Cookie.php	Adds error messages.
tests/system/Cookie/CookieTest.php	Adds regression coverage.
user_guide_src/source/libraries/cookies.rst	Documents attribute validation.
user_guide_src/source/changelogs/v4.7.5.rst	Records the fix.

Review details

Suppressed comments (1)

system/Cookie/Cookie.php:458

• withPrefix() has the same non-raw bypass: an invalid prefix is stored unchanged and later causes native setcookie() to throw because prefixes are not URL-encoded by getPrefixedName(). Prefix character validation must run regardless of the cookie's raw mode.

            $this->validateName($prefix, $this->raw);

• Files reviewed: 6/6 changed files
• Comments generated: 1
• Review effort level: Balanced

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