Josha Mamadou Karaboue Vagnoman (born 11 December 2000) is a German professional footballer who plays as a defender for Bundesliga club VfB Stuttgart and the Germany national team.

In February 2018, following impressive performances in the youth teams, newly appointed head coach Bernd Hollerbach promoted him to the HSV first-team squad for the forthcoming campaign.

Prior to the 2018–19 season, Vagnoman signed a new two-year contract with Hamburger SV, making him a permanent part of the first-team squad before his eighteenth birthday.

Coach Titz and his successor, Hannes Wolf, preferred Gōtoku Sakai and Douglas Santos on the two back positions during this period.

After regular right-back Jan Gyamerah suffered a fibular fracture in mid-September,[9] Vagnoman replaced him in the starting lineup in the following league game and made five straight appearances, in which he scored one goal.

[10] In his absence, Khaled Narey took over as the third player to appear at right-back before Jordan Beyer arrived on loan during the January transfer window.

Due to an injury to Gyamerah, Vagnoman returned to the starting line-up on 5 December 2020 in a 1–0 home loss to Hannover 96, and was a regular starter until the end of the first half of the season, scoring 2 goals.

[22] On 27 February, he made his competitive return in a 3–2 home loss in the Nordderby to Werder Bremen, coming off the bench in the 82nd minute for Moritz Heyer.

[25] On 7 August, he made his Bundesliga debut for Stuttgart, starting on the opening matchday in a 1–1 home draw against RB Leipzig.

[citation needed] On 17 March 2023, he received his first official call-up to the German senior national team for the friendlies against Peru and Belgium.