# AC-10 Concurrent Session Control

NIST SP 800-53 control. Family: AC Access Control. Function: preventative. Baselines: high. Mapping licence: CC BY-SA 4.0.

Statement: Limit the number of concurrent sessions for each [Assignment: organization-defined account and/or account type] to [Assignment: organization-defined number].
Guidance: Organizations may define the maximum number of concurrent sessions for system accounts globally, by account type, by account, or any combination thereof. For example, organizations may limit the number of concurrent sessions for system administrators or other individuals working in particularly sensitive domains or mission-critical applications. Concurrent session control addresses concurrent sessions for system accounts. It does not, however, address concurrent sessions by single users via multiple system accounts.

## Patterns that use it (4)
- Important (1): SP-008 Public Web Server Pattern
- Standard (3): SP-002 Server Module; SP-019 Secure Ad-Hoc File Exchange Pattern; SP-030 API Security

## Clauses by framework (38 frameworks)
- iso_27002_2022: 5.15
- cobit_2019: DSS05
- nist_csf_2: PR.AA-05
- nis2: Art. 21(2)(i)
- mas_trm: 9
- bsi_grundschutz: ORP.4
- anssi: Hygiene.12, SecNumCloud.10.5
- osfi_b13: B-13.3.2
- finma_circular: IV.B.d(59), IV.C(61)
- gdpr: Art.32(1)(b)
- dora: Art.9(4)(c)
- bio2: 5.15
- rbi_csf: Annex1.8
- fisc: FISC.T2
- hkma_tme1: TME1.8.4
- cbb_tm: TM-6
- cbuae: CR-4
- nca_ecc: 2-2
- qatar_nia: AC
- sama_csf: 3.1
- uae_ia: T9
- bog_cisd: CISD-VIII
- bom_ctrm: 3.3
- cbe_csf: CTO-1
- cbn_csf: Part3.2
- sa_js2: JS2-7.1
- bot_cyber: Ch2.2
- eba_ict: 3.4.2
- ecb_croe: CROE.2.3.1
- ffiec_is: II.C.15
- iosco_cyber: PROT-1
- sebi_cscrf: PR.AA
- cmmc_2: AC
- ieee_1686: 5.8
- common_criteria: CC Part 2 — FRU/FTA/FTP
- hitrust_csf: 01.c
- iso_27799: 9.5
- lloyds_ms: MS8.3
OSA's mapping for nist_csf_2 takes NIST's published crosswalk as its base. A clause not marked as OSA's own is in that crosswalk.

## More
- This control as JSON, with guidance and ATT&CK techniques: /api/v1/controls/AC-10
- Clauses only: /api/v1/controls/AC-10?fields=mappings
- Page for people: /controls/ac-10/