Language: JavaScript
Label: vulnerable
CWE: CWE-331 \u2014 Insufficient Entropy
The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.

Code:
        WebCryptography.prototype.decryptArrayBuffer = function (key, ciphertext) {
            return __awaiter(this, void 0, void 0, function () {
                var abIv;
                return __generator(this, function (_a) {
                    abIv = ciphertext.slice(0, 16);
                    return [2 /*return*/, crypto.subtle.decrypt({ name: 'AES-CBC', iv: abIv }, key, ciphertext.slice(16))];
                });
            });
        };