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Web Application Security Score Calculator

Roll eight security pillars and your open finding counts into one application security score with a deduction for live risk.

About Web Application Security Score Calculator

The pillar weights are ordered by how often each one is the root cause of a real breach, which puts input validation, authentication and access control at the top and configuration at the bottom. The deduction exists because maturity and current exposure are different things: a mature programme with an open critical finding is still exposed today. Programme-level maturity and the open-findings queue are usually reported separately, which lets a good average hide a live critical — combining them stops that.

Formulas

Web Application Security Score

pillar score = 0.18 input validation + 0.16 authentication + 0.16 access control + 0.14 transport + 0.12 headers + 0.10 dependencies + 0.08 logging + 0.06 configuration, each 0–100.

pillar score
Weighted maturity across the eight pillars
weights
Sum to 1.00, ordered by exploitability

Live risk deduction

final score = pillar score − (8 × critical + 3 × high + 1 × medium open findings), floored at zero.

deduction
Points removed for findings that are open right now
critical
A finding an attacker could use today

Worked example

With the default values below, Web Application Security Score Calculator returns Application Security Score of 34. Change any input above and every figure here is recalculated in your browser.

Inputs used

Input validation and encodingaccepts 0–100 %
70 %
Authentication and session managementaccepts 0–100 %
80 %
Authorisation and access controlaccepts 0–100 %
65 %
Cryptography and transport securityaccepts 0–100 %
85 %
Security headers and browser policyaccepts 0–100 %
60 %
Dependency and supply-chain hygieneaccepts 0–100 %
55 %
Logging, monitoring and alertingaccepts 0–100 %
50 %
Secure configuration and secrets managementaccepts 0–100 %
75 %
Open critical findingsaccepts 0–1,000 findings
1 findings
Open high findingsaccepts 0–1,000 findings
4 findings
Open medium findingsaccepts 0–1,000 findings
15 findings

Results

Application Security Score
34 / 100
Security Grade
F — Critical
Weighted Pillar Score
68.9 / 100
Deduction for Open Findings
35 points
Weakest Pillar
Logging, monitoring and alerting
Highest-Value Fix
Close the 1 open critical finding(s) — each costs 8 points

Step by step

  1. 1Values used
  2. 2Web Application Security Score
  3. 3Live risk deduction
  4. 4Application Security Score= 34 / 100
  5. 5Security Grade= F — Critical
  6. 6Weighted Pillar Score= 68.9 / 100
  7. 7Deduction for Open Findings= 35 points
  8. 8Weakest Pillar= Logging, monitoring and alerting
  9. 9Highest-Value Fix= Close the 1 open critical finding(s) — each costs 8 points

Assumptions and limits

  • The result is derived only from the 11 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Web Application Security Score calculated?

pillar score = 0.18 input validation + 0.16 authentication + 0.16 access control + 0.14 transport + 0.12 headers + 0.10 dependencies + 0.08 logging + 0.06 configuration, each 0–100. The pillar weights are ordered by how often each one is the root cause of a real breach, which puts input validation, authentication and access control at the top and configuration at the bottom. The deduction exists because maturity and current exposure are different things: a mature programme with an open critical finding is still exposed today.

Why does Web Application Security Score matter?

Programme-level maturity and the open-findings queue are usually reported separately, which lets a good average hide a live critical — combining them stops that.

What values do I need to enter?

This calculator takes 11 inputs: Input validation and encoding, Authentication and session management, Authorisation and access control, Cryptography and transport security, Security headers and browser policy, Dependency and supply-chain hygiene, Logging, monitoring and alerting, Secure configuration and secrets management, Open critical findings, Open high findings, Open medium findings. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

Why does one critical finding cost eight points?

To keep the score honest. Eight points is roughly the difference between two grade bands, so a single exploitable finding visibly moves the number and cannot be averaged away by a strong pillar elsewhere. Adjust the weight if your severity definitions are stricter or looser than the usual ones.

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