Anthropic Organization Domain Boundary Changed

Last updated 4 days ago on 2026-09-21

Created 13 days ago on 2026-09-12

About

Verified organization domains control which email addresses can join or be pulled into an Anthropic tenant. Verifying, claiming, adding, or removing a domain changes the tenant boundary and can pull in attacker-controlled mailboxes or push out legitimate corporate domains. These events are infrequent and affect organization-wide membership trust.

Tags

Domain: GenAIPlatform: AnthropicData Source: Anthropic Audit LogsUse Case: Identity and Access AuditUse Case: Threat DetectionRule Type: ES|QLTactic: PersistenceLanguage: esql

Severity

high

Risk Score

MITRE ATT&CK™

Persistence (TA0003)(external, opens in a new tab or window)

↳ Account Manipulation (T1098)(external, opens in a new tab or window)

False Positive Examples

IT and identity teams verify or add corporate domains during tenant onboarding, mergers, or DNS migrations. Confirm the domain and actor against change management records.

License

Elastic License v2(external, opens in a new tab or window)

Definition

Integration Pack: Prebuilt Security Detection Rules
Related Integrations: anthropic(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗from logs-anthropic.audit-* metadata _id, _version, _index
| where
    data_stream.dataset == "anthropic.audit" and
    mv_contains(event.category, "configuration") and
    event.action in (
        "org_domain_verified",
        "org_domain_removed",
        "org_domain_add_initiated",
        "domain_claim_initiated"
    )
| keep _id, _version, _index, @timestamp, event.*, organization.*, user.*, source.*, user_agent.*, anthropic.audit.*, data_stream.*

Install detection rules in Elastic Security

Detect Anthropic Organization Domain Boundary Changed in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).