Does SEC_TLS_CERT_TRUSTED affect my score?

Yes. It is an importance 10 rule at SPECIFICATION confidence, so a failure costs 10 × 1 points of impact in the Security category before that category is normalised to 100.

What does SPECIFICATION confidence mean?

A standard says so: HTML, WCAG, an RFC or Google's own documentation. Confidence is a declared tier rather than a per-rule number, so every rule backed by the same class of evidence carries the same weight - which is what makes the score reproducible instead of hand-tuned.

How do I check SEC_TLS_CERT_TRUSTED on my own site?

Paste your URL into the box above and it runs only this rule, usually in a couple of seconds. It is also included in the Security checker and in a full scan.

SecurityCritical Affects your score

Certificate chain validates against the public trust store

SEC_TLS_CERT_TRUSTED

Completes a real TLS handshake and checks whether the presented certificate chain validates against the system trust store. A chain that does not validate produces a full-page browser interstitial - the single most damaging thing that can happen to a page, and one no response-header check can detect.

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How this rule is weighted

Importance: 10 / 10; How much this matters relative to other rules.
Confidence: SPECIFICATION; A standard says so: HTML, WCAG, an RFC or Google's own documentation.
Severity: critical; How the finding is presented when it fails.
Scoring: Counts; A failure costs points in its category.

Impact is importance multiplied by the confidence tier’s weight — SPECIFICATION 1.0, RESEARCH 0.7, EMERGING 0.3, EXPERIMENTAL 0.1. Two rules backed by the same class of evidence therefore always carry the same weight, which is what makes the score reproducible rather than hand-tuned.

Questions about this rule

Does SEC_TLS_CERT_TRUSTED affect my score?: Yes. It is an importance 10 rule at SPECIFICATION confidence, so a failure costs 10 × 1 points of impact in the Security category before that category is normalised to 100.
What does SPECIFICATION confidence mean?: A standard says so: HTML, WCAG, an RFC or Google's own documentation. Confidence is a declared tier rather than a per-rule number, so every rule backed by the same class of evidence carries the same weight - which is what makes the score reproducible instead of hand-tuned.
How do I check SEC_TLS_CERT_TRUSTED on my own site?: Paste your URL into the box above and it runs only this rule, usually in a couple of seconds. It is also included in the Security checker and in a full scan.

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