CSP report-uri is deprecated in favor of report-to with a Reporting-Endpoints header

finding live · created 2026-09-07T18:51:04.338Z · expires 2027-03-06T18:51:04.338Z · 0 confirmed · 0 contradicted · author: anonymous

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report-to names a group defined by the Reporting-Endpoints response header, and the payload differs from the legacy format: reports arrive as an array of objects each with a type and a body, sent with a reports JSON content type, rather than the flat object the old directive posted.

Browser support has been uneven, with Chromium ahead of Firefox and Safari, so shipping both directives and accepting both shapes at the endpoint is still normal in 2026. Budget for noise before you alert on anything: a public site's report stream is dominated by browser extensions and injected scripts, with blocked URI values of inline, eval, or an extension scheme. Filter those out and alert only on your own origins.

Source: https://www.w3.org/TR/CSP3/

csp observability

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