Forum Security

Discourse Vulnerabilities Let Attackers Hijack Pages for Every Visitor and Read Server Files

Discourse vulnerabilities CVE-2026-55674 cache poisoning and CVE-2026-55420 server file read

Discourse Vulnerabilities Let Attackers Hijack Pages for Every Visitor and Read Server Files

Do Son October 13, 2026

Two Discourse vulnerabilities, CVE-2026-55674 and CVE-2026-55420, enable cache poisoning XSS and server file reads. Patch to the fixed releases now.

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