zyouhourouei to akaunto no nottori ha abunai.

A natural breakdown is:

• 情報漏洩 = information leak / data leak
• と = and
• アカウントの乗っ取り = account hijacking / takeover of an account
• は = topic marker
• 危ない = dangerous / risky

So the structure is basically:

A と B は 危ない。
= A and B are dangerous.

The topic of the sentence is the whole combination 情報漏洩とアカウントの乗っ取り.

Because 情報漏洩 is a compound noun, not a phrase like 情報の漏洩.

Both are possible:

• 情報漏洩 = a set compound meaning information leakage / data breach
• 情報の漏洩 = literally leakage of information

The version without の is very common in formal, technical, business, or security-related language. It sounds compact and written-like.

乗っ取り is a noun form derived from the verb 乗っ取る.

• 乗っ取る = to seize, take over, hijack
• 乗っ取り = takeover, hijacking

So:

• アカウントの乗っ取り = hijacking of an account
• in more natural English, often account hijacking or account takeover

This kind of noun formation is very common in Japanese:

• 盗む → 盗み
• 話す → 話し
• 乗っ取る → 乗っ取り

Because this sentence uses a noun phrase, not a verb phrase.

• アカウントの乗っ取り = the hijacking of an account
  
  • の links the noun アカウント to the noun 乗っ取り
• アカウントを乗っ取る = to hijack an account
  
  • を marks the direct object of the verb 乗っ取る

So compare:

• アカウントの乗っ取りは危ない。
  = Account hijacking is dangerous.

• アカウントを乗っ取るのは危ない。
  = Hijacking an account is dangerous.

Both are grammatical, but they are built differently.

と is the standard particle for joining nouns, like and.

Here it connects two noun phrases:

• 情報漏洩
• アカウントの乗っ取り

So:

情報漏洩とアカウントの乗っ取り
= information leakage and account hijacking

It is a straightforward noun-listing use of と.

Because the entire expression 情報漏洩とアカウントの乗っ取り is the topic of the sentence.

Japanese often marks the topic with は, then comments on it.

So the structure is:

• [情報漏洩とアカウントの乗っ取り] は = as for information leakage and account hijacking
• 危ない = they are dangerous / risky

It is not that only 乗っ取り is the topic. The whole combined phrase before は is the topic.

Both can work, but they have slightly different feel.

• 危ない = dangerous, risky, unsafe
  
  • common, direct, conversational
• 危険だ = dangerous
  
  • a bit more formal, objective, or technical

So:

• 情報漏洩とアカウントの乗っ取りは危ない。
  sounds natural and direct
• 情報漏洩とアカウントの乗っ取りは危険だ。
  sounds a bit more formal or official

In security warnings, either can appear depending on tone.

Japanese adjectives do not change for singular vs. plural.

So 危ない can describe:

• one thing
• two things
• many things

The sentence does not need a special plural form. Japanese works differently from English here.

Here it means something like dangerous / risky / something to watch out for.

Depending on context, 危ない can mean:

• physically dangerous
• unsafe
• risky
• close to trouble

In this sentence, since the topic is cybersecurity-related, it is best understood as:

• dangerous
• serious risks
• things that can cause harm

So it is not about physical danger only. It includes security risk.

The standard readings are:

• 情報漏洩 → じょうほうろうえい
• と → と
• アカウント → あかうんと
• の → の
• 乗っ取り → のっとり
• は → written は, pronounced わ
• 危ない → あぶない

So the whole sentence is read:

じょうほうろうえい と あかうんと の のっとり は あぶない。

Because アカウント is a loanword from English account.

Katakana is commonly used for:

• foreign loanwords
• technical terms
• brand-like or modern vocabulary
• emphasis in some cases

In IT and security contexts, katakana words are extremely common, so アカウント is completely normal.

No. Normal Japanese is usually written without spaces between words.

The natural written form is:

情報漏洩とアカウントの乗っ取りは危ない。

Spaces are often added only in learning materials to make word boundaries easier to see.

It is understandable and basically correct, but depending on context, some native speakers might prefer a slightly more specific or formal phrasing, such as:

• 情報漏洩やアカウントの乗っ取りは危険です。
• 情報漏洩やアカウントの乗っ取りに注意が必要です。
• 情報漏洩やアカウント乗っ取りは危険です。

Why? Because in security writing, people often like language that sounds a bit more precise or formal.

Still, 情報漏洩とアカウントの乗っ取りは危ない。 is not wrong. It sounds like a clear warning in plain language.

Yes, but the nuance changes.

• と = an exact, complete-sounding and
• や = such as ... and ..., a non-exhaustive list

So:

• 情報漏洩とアカウントの乗っ取りは危ない。
  = information leakage and account hijacking are dangerous

• 情報漏洩やアカウントの乗っ取りは危ない。
  = things like information leakage and account hijacking are dangerous

If you are giving examples of possible security problems, や can sound more natural.

Yes. アカウント乗っ取り is also very common, especially in headlines, warnings, and technical writing.

Compare:

• アカウントの乗っ取り = slightly fuller, more phrase-like
• アカウント乗っ取り = more compact, label-like, common in written notices

Both mean basically the same thing. Japanese often allows this kind of compact compound style in formal or technical contexts.