Anthropic Organization User Invite Sent

Last updated 4 days ago on 2026-09-21

Created 9 days ago on 2026-09-16

About

Sending an organization user invite creates a path for a new member to join the Anthropic tenant with a chosen role. An adversary who compromises an administrator or admin API key can invite a mailbox they control and accept the invite to gain durable access. Invites may target internal corporate addresses or external domains; this rule does not distinguish them because invite events do not carry verified organization domains for reliable comparison.

Tags

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

Severity

medium

Risk Score

MITRE ATT&CK™

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

↳ Create Account (T1136)(external, opens in a new tab or window)

False Positive Examples

IT administrators and hiring workflows routinely invite new members during onboarding, contractor access, or staffing changes. Verify the invited email, role, and that a hiring or access request exists when policy requires one.

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, "iam") and
    event.action == "org_user_invite_sent" and
    event.outcome == "success"
| keep _id, _version, _index, @timestamp, event.*, organization.*, user.*, related.*, source.*, user_agent.*, anthropic.audit.*, data_stream.*

Install detection rules in Elastic Security

Detect Anthropic Organization User Invite Sent 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).