There's a couple of ways to translate that. There's the way you did:

> "I know about some security flaws (or behind-the-scenes issues with the dev teams) in other products, but I can't reveal them publicly because of NDAs, etc"

But there is also:

> "I know enough to recommend this product, but I don't know enough about the other products -- not necessarily because I lack the skill, but because I haven't spent the time -- to endorse/recommend them."