What Is a Security Posture Score and Why Does It Matter?
Understand what a posture score measures, how it is calculated, and how to use it to improve your business security.
What is a security posture score?
A security posture score is a number (typically 0 to 100) that summarizes how well-protected your technology infrastructure is. Think of it like an exam grade: it measures how many security controls you have correctly configured versus how many have gaps.
How it's calculated
Different vendors calculate the score differently. Microsoft has its own "Secure Score" within the admin portal. simiriki's free Audit evaluates the 155 Microsoft Graph rules of the 201-rule library against your Microsoft 365 tenant (the 46 Azure Resource Manager controls add on with admin consent) and produces an independent posture score.
Each finding deducts points based on severity:
- Critical: -15 points (MFA disabled, DMARC not enforced, admin accounts without protection)
- High: -8 points (auto-forwarding enabled, unrestricted sharing, legacy auth not blocked)
- Medium: -3 points (auditing not enabled, sensitivity labels not configured)
- Low: -1 point (sub-optimal configurations that aren't directly exploitable)
A perfect score of 100 means every evaluated rule passed. Most SMBs score between 45 and 65 on their first scan.
What each range means
| Score | Grade | Interpretation |
|-------|-------|----------------|
| 90-100 | A/A+ | Excellent. Few or no critical gaps. Top 10% of SMBs. |
| 80-89 | B+ | Good posture. Minor improvements needed in 1-2 areas. |
| 70-79 | B/B- | Decent foundation but notable gaps that sophisticated attacks could exploit. |
| 60-69 | C | Average. Several high-risk findings represent ongoing exposure. |
| 40-59 | D | Below average. Significant vulnerabilities that automated attacks target. |
| 0-39 | F | Critical. Your tenant is actively exploitable with off-the-shelf tools. |
Why it matters
The score isn't just a vanity metric. It has practical applications:
1. Communicate risk to executives — "We're at 47 out of 100" is clearer than "we have security findings." Board members and C-suite understand numbers.
2. Measure progress over time — if you implement controls and the score rises from 47 to 78, you can demonstrate ROI on security investment.
3. Benchmark against your industry — are you better or worse than similar companies? (Manufacturing SMBs in Mexico average around 52.)
4. Prioritize spending — the findings that most reduce the score are the ones with the most impact. Fix those first.
5. Satisfy audit requirements — auditors and insurers increasingly ask for posture evidence. A trend chart showing improvement is powerful.
How to improve your score quickly
The fastest wins for most SMBs:
1. Enable MFA for all users — typically the single biggest finding. Adds ~15 points if it was failing.
2. Set DMARC to "reject" — blocks email spoofing. Adds ~8 points.
3. Disable unrestricted external sharing — prevents accidental data exposure. Adds ~8 points.
4. Block legacy authentication — closes the backdoor that bypasses MFA. Adds ~8 points.
Those 4 changes can raise your score 20-40 points in under an hour without interrupting your team.
Microsoft Secure Score vs simiriki's posture score
Microsoft's built-in Secure Score is useful but limited:
- Only covers Microsoft's own recommendations (not industry frameworks like CIS or CISA CPG)
- Doesn't evaluate email authentication (SPF, DKIM, DMARC) deeply
- Requires admin access to view (not shareable with external stakeholders)
- Doesn't track trend over time automatically
simiriki's free scan evaluates 155 Microsoft Graph rules (including all email authentication standards); Operación adds the 46 Azure infrastructure rules, a weekly trend, and email reports — making it useful for ongoing governance, not just one-time checkups.
Is your business protected?
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