bool CSPSourceList::parseScheme(const UChar* begin, const UChar* end, String& scheme)
{
    ASSERT(begin <= end);
    ASSERT(scheme.isEmpty());

    if (begin == end)
        return false;

    const UChar* position = begin;

    if (!skipExactly<UChar, isASCIIAlpha>(position, end))
        return false;

    skipWhile<UChar, isSchemeContinuationCharacter>(position, end);

    if (position != end)
        return false;

    scheme = String(begin, end - begin);
    return true;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.