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Discourse discourse-activity-pub

CVE-2026-55103 High 8.6 Discourse ActivityPub: Fix inbound actor validation and apply outbound request SSRF hardening 0.2%

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Exploit-availability signals from CVSS-BT by Stephen Shaffer (MIT license), which aggregates Metasploit (BSD), Nuclei templates (MIT), PoC-in-GitHub (CC0) and NVD (public domain).

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