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cpe:2.3:a:discourse:discourse-activity-pub:*:*:*:*:*:*:*:*

part: a version: * update: *

VendorDiscourse (2d3c125b-857a-5933-b846-ed7f9d5e0225)
ProductDiscourse Activity Pub (4fabe3ca-4576-58eb-8ed4-caa1f64b32a4)
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Notes

Imported from gcve-enriched-dumps CVE data

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Vulnerability references

IdentifiercpeApplicabilitySubmitteddb.gcve.eu detailsRationale
CVE:CVE-2026-55103 vulnerable 2026-11-03 10:16:33.401924 Discourse ActivityPub: Fix inbound actor validation and apply outbound request SSRF hardening
HIGH (8.6)
Discourse ActivityPub adds ActivityPub support to Discourse. Prior to commit 1c8518b0f2abdf31cbea3e0b242f74d8994a9ba5, inbound ActivityPub processing does not sufficiently verify that the actor authenticated by the signed request matches the Activity actor and owns the referenced federated post. A remote attacker can exploit these missing identity and ownership checks to edit, delete, or reply to federated posts without the required permissions. This vulnerability is fixed with commit 1c8518b0f2abdf31cbea3e0b242f74d8994a9ba5.
Published: 2026-10-15T17:05:41.414Z
Updated: 2026-10-28T20:15:11.416Z
Reference links
Imported from gcve-enriched-dumps CVE data

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