Inflite The Jet Centre said in a statement it believes “the scope of the incident was limited to email accounts only” and has reported it to the Information Commissioner’s Office (ICO).
The BBC has contacted the ICO for comment.
Professor Sara de Jong from the Sulha Alliance charity that supports Afghans who worked for the British Army called the breach “astonishing”.
“The last thing that Afghans – who saved British lives – need is more worries about their own and their families’ lives,” she said.
Prof de Jong also urged the MoD to commit to expediting all pending cases of Afghans waiting for relocation.
The incident follows a February 2022 incident in which the personal data of nearly 19,000 Afghans who had applied to move to the UK under the Arap scheme was mistakenly leaked by a British official, leading to thousands of Afghans being secretly relocated to the UK.
The leaked spreadsheet contained the names, contact details and some family information of the people potentially at risk of harm from the Taliban.
That incident was made public for the first time in July.
BBC’s Newsnight programme has meanwhile spoken to the son of a senior commander in the Afghan “Triples” elite special forces who worked with the British Army and was part of the original MoD data breach.
The senior commander was promised sanctuary in the UK and, at the time of the interview, he and his family were staying at a hotel in Pakistan awaiting relocation.
The senior commander faced imminent deportation back to Afghanistan, Newsnight reported, after local authorities raided his Islamabad hotel.
The commander’s son, who managed to hide from the authorities and speak to the BBC, said his family would not survive if they returned to Afghanistan after their personal details were leaked.
“Please help my family and avoid their murder by the Taliban,” the commander’s son said, in a plea to the British government.
On Friday, after the interview, Newsnight learned the senior commander was deported back to Afghanistan.
In response to news of the deportation, the MoD said in a statement that it was “honouring commitments” to all eligible people who pass their relevant checks for relocation.
“As the public would rightly expect, anyone coming to the UK must pass strict security and entry checks before being able to relocate to the UK.
“In some cases people do not pass these checks,” it said.
Speaking on Newsnight, Sir Mark Lyall Grant, former UK national security adviser, called both breaches “deeply embarrassing” for the British government.
He added that while checks for relocation are necessary, it falls to the British government to “honour the commitment they made”.
“We do need to move faster to protect people who genuinely are at risk of being victimised and persecuted by the Taliban if they go back,” he said.
Also on Newsnight, former Conservative Chancellor Kwasi Kwarteng said the data breaches were “very serious” and “really concerning” for people facing deportation back to Afghanistan.