↳ GitHub sourceAnalytics ruleMedium

Tailscale: Policy file (ACL) modified

Description

Identifies when the tailnet ACL/policy file is modified. Review the diff - incorrect ACLs can silently expand blast radius across the tailnet.

Rule type: Scheduled
Version: 1.0.0
Declared status: Available
Query frequency: 15m
Query period: 15m
Trigger: gt 0

Declared MITRE coverage

Declared sources

Metadata from the source file. No dependencies inferred from KQL.

Connectors

TailscaleCCF

Data types

Tailscale_Audit_CL

KQL query

Original query, unchanged.

Tailscale_Audit_CL
| where Action == "UPDATE"
| where tostring(Target.type) == "TAILNET"
| where tostring(Target.property) == "ACL"
| extend ActorLogin = tostring(Actor.loginName)
| project TimeGenerated, ActorLogin, Action, Target, Origin, Old, New

Declared entities

Account

Source provenance

GitHub

Displayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.

File: Solutions/Tailscale (CCF)/Analytic Rules/TailscalePolicyfileACLmodified.yaml ↗
Commit: 9800e51 ↗
Source identifier: 1e7249c2-1a9d-05fd-45cb-c859eef5b8ae

Additional source files 2

Solutions/Tailscale (CCF)/Analytic Rules/TailscalePolicyfileACLmodified.yamlsource ↗Solutions/Tailscale (CCF)/Data/Solution_Tailscale.jsonsolution-membership ↗

GSTEP / CATALOG TRACKING

Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC

GSTEP sync dates, separate from the source content’s publication dates.