The latest breach, reported by The Sunday Times, revealed that details of at least 20 special forces soldiers from the Grenadier Guards have been publicly accessible online for a decade.
These soldiers were identified through regimental publications, with a codename 'MAB' linking them to the UK special forces headquarters.
General Sir Roly Walker, head of the army, has ordered an immediate review of data-sharing arrangements to prevent future incidents, and affected individuals have been notified and protected.