score

Score a session's generated CSP policy against security best practices.

Usage

csp-analyser score [session-id] [options]

When session-id is omitted, the most recent completed session is used automatically.

Options

Option	Default	Description
--strictness <level>	moderate	Strictness used when generating the policy to score.

Scoring system

The score starts at 100 points and applies deductions for dangerous patterns and bonuses for security best practices. The final score is clamped to the 0-100 range.

Grades

Grade	Score range
A	90-100
B	75-89
C	55-74
D	35-54
F	0-34

What it checks

Critical issues (large deductions)

Check	Points	Trigger
'unsafe-eval' in script directives	-30	Allows arbitrary code execution via eval()
'unsafe-eval' in default-src (no script-src override)	-30	Falls through to script execution
Wildcard * in default-src, script-src, or script-src-elem	-25	Allows loading from any origin

Warnings (moderate deductions)

Check	Points	Trigger
'unsafe-inline' in script directives	-20	Allows inline scripts (XSS risk)
'unsafe-inline' in default-src (no script-src override)	-20	Falls through to inline scripts
data: URIs in script directives	-20	Can be used for script injection
Missing default-src	-15	No fallback for undeclared directives
Wildcard * in non-critical directives	-10	Overly permissive

Info (minor deductions)

Check	Points	Trigger
Missing object-src	-5	Plugins not blocked (unless default-src 'none')
Missing base-uri	-5	Base tag injection possible
Missing form-action	-5	Forms can submit to any origin

Positive signals (bonuses)

Check	Points	Trigger
Nonces or hashes used	+10	Script integrity via 'nonce-...' or 'sha256-...'
'strict-dynamic' present	+5	Trust propagation from nonces/hashes
Violation reporting configured	+5	report-uri or report-to present

Example output

CSP Score: 75/100 (Grade: B)

Issues:
  [!] 'unsafe-inline' allows inline script execution (XSS risk) (-20 pts)
  [?] Missing base-uri - consider adding base-uri 'self' to prevent base tag injection (-5 pts)

Strengths:
  [+] Uses nonces or hashes for script integrity (+10 pts)
  [+] Violation reporting is configured (+5 pts)

Finding icons:

• !! = critical issue
• ! = warning
• ? = informational suggestion
• + = positive signal

Examples

Score the default policy

csp-analyser score abc123

Score a strict policy

csp-analyser score abc123 --strictness strict

A stricter policy typically scores higher because it avoids 'unsafe-inline' and prefers hashes. Use --hash to replace 'unsafe-inline' with SHA-256 hashes computed from the full inline content extracted during crawling, or --nonce to replace it with nonce placeholders.

Compare scores across strictness levels

for level in strict moderate permissive; do
  echo "=== $level ==="
  csp-analyser score abc123 --strictness $level
  echo
done