An inmate at HMP Woodhill was caught with a copy of al Qaida magazine Inspire, the Ministry of Justice has revealed.
New figures reveal a number of instances of the banned publication being discovered at high-security prisons over the past five years.
The inmate at HMP Woodhill in Milton Keynes was found with a copy in 2013. Other prisoners at HMP Manchester, Belmarsh Prison in London and HMP Frankland in Durham also had the magazine confiscated.
The magazine formed part of the prisoners' defence paperwork, but possession of it could be a criminal offence. In each case it was removed.
The information was released in response to a parliamentary question tabled by shadow justice secretary Richard Burgon.
A transgender inmate has been found dead at Woodhill Prison in Milton Keynes.
Staff and paramedics attempted resuscitation on Joanne Latham but she was pronounced dead early on Friday morning
An investigation will now be carried out by the independent Prisons and Probation Ombudsman.
Trunkfield passed on details about one of James Bulger's killers, Jon Venables. He admitted misconduct in a public office earlier this month.
Trunkfield has since resigned from Woodhill prison and Venables is no longer being held there, the court heard. He was jailed for 16 months,.
A prison officer who worked at a jail near Milton Keynes has been jailed for selling information to the Sun newspaper.
Richard Trunkfield, who worked at high security Woodhill prison was sentenced at the Old Bailey.
An inquest jury has ruled that an alleged double killer who was found hanged in a Milton Keynes prison took his own life.