CVE-2026-55103Published

Discourse ActivityPub: Fix inbound actor validation and apply outbound request SSRF hardening

Exact source revision recorded 28 Oct 2026 21:55:13 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-55103

Published

discourse-activity-pub

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "discourse",
                    "product": "discourse-activity-pub",
                    "versions": [
                        {
                            "version": "< 1c8518b0f2abdf31cbea3e0b242f74d8994a9ba5",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON