The full answer
Vinegar itself is not treated the same as wine.
Islamic jurisprudence recognizes that a substance can undergo genuine transformation and become a different substance; the classical example often discussed is wine becoming vinegar.
Ordinary vinegar can therefore be consumed, while flavored products should still be checked for any additional impermissible ingredients.
Answers in the Halal Knowledge Center reflect the standards followed by Halal Monitoring Services (HMS), which operates as part of the Shariah Board of America. HMS certifies only what it checks.