Top Risks

• THREAT FEED: extension ID independently confirmed malicious by TPCI chrome-mal-ids — Oshi No Ko Wallpapers New Tab by Gameograf [adware] + malext.io malicious_extension_sentry (+2.5, capped).
• NewTab override replaces every new tab page — high reach monetization surface.
• Uninstall and install URL hijack redirect to gameograf.com with UTM tracking.
• No CSP defined (MV3 default); innerHTML sink in popup.js elevates DOM-XSS risk.
• months_since_update=15 approaches stale threshold; no sibling cluster but pattern is fan-content shell.

Evidence

• newtab_override manifest chrome_url_overrides.newtab=index.html; every new tab replaced, high reach.
• uninstall_url_hijack crx setUninstallURL targets gameograf.com with UTM tracking params.
• install_url_hijack crx onInstalled opens gameograf.com with UTM tracking params.
• external_host_github_pages crx mlionltd.github.io listed in js_external_hosts; uncontrolled third-party domain.
• csp_absent manifest content_security_policy is null; no CSP despite innerHTML sink in popup.js.
• dom_xss_sink crx dom_sink_innerhtml_userctrl in js/popup.js; no CSP to mitigate.
• verified_publisher store gameograf.com resolves, not throwaway; verified publisher discount applied.
• privacy_policy_adequate api Policy fetched; scope_extension, data_collection, retention, third_party_sharing all true.
• threat_feed_membership api Extension ID listed by TPCI chrome-mal-ids — Oshi No Ko Wallpapers New Tab by Gameograf [adware] + malext.io malicious_extension_sentry; score 4.07 -> 6.57 (+2.5 cap 2.5).

Permissions Breakdown

• search medium Allows overriding search provider; medium risk in context of NewTab extension.
• host_permissions: https://api.gameograf.com/* low Scoped to dev-owned API domain only; limited blast radius.
• chrome_url_overrides.newtab medium Replaces every new tab; high-reach surface for monetization or data collection.

Pillar Scores

Bookkeeping