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Advisories / SA-2026-039

SA-2026-039: No clickjacking protection

Severitylow
Statusaccepted
WeaknessCWE-1021
ComponentGitHub Pages
Found bysecurity@php.newsroom
Found2026-10-22
Fixed innot yet

What it is

frame-ancestors needs a response header, which GitHub Pages does not let us set.

What an attacker could do

Another site can frame these pages.

How: Public.

Root cause

Platform limit.

What would fix it

Revisit when the site moves to a host that sets headers.