Here is the relevant language from the official Austrian website with travel info (https://www.austria.org/current-travel-information):
As Bosnia does not currently fit into Annex 1 or Annex 2:
C. ENTRY FROM OTHER COUNTRIES
Travelers arriving from countries of territories not listed in Annex 1 or Annex 2, or who have been in such a country/territory within the past 10 days before entering Austria, must
complete the pre-travel registration form (no earlier than 72 hours before entry),
present upon entry a certificate of vaccination/recovery (see requirements above), or a negative molecular-biological COVID-19 test (taken no earlier than 72 hours (PCR test) or 48 hours (rapid/antigen test) before entry),
AND must observe a mandatory 10-day quarantine at their residence or at an appropriate accommodation at their own cost. The residence/hotel may not be left for the quarantine period. Quarantine may be terminated upon presentation of a negative COVID-19 test taken no earlier than five days after entry. Fully vaccinated (14 days after the last dose) persons, business travelers, persons subject to a compulsory duty imposed by a court or public authority by Austria, persons entering Austria for unexpected particular considerable reasons within the family or commuters entering Austria regularly (at least once a month) for family reasons or the visit of a life partner are exempt from mandatory registration and quarantine.