CVE Watch30 oct 2026

CVE-2026-63115

ActivityPub is a multi-tenant ActivityPub server for Ghost, built with Fedify. From 1.0.0 until 1.2.6, the `Undo` handler allows a remote fe

CVSS

5.3

Medio

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 30 oct 2026 · Última mod.: 30 oct 2026 · CWE-290 · CWE-345 · CWE-863

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

ActivityPub is a multi-tenant ActivityPub server for Ghost, built with Fedify. From 1.0.0 until 1.2.6, the `Undo` handler allows a remote federated server to cause the service to act on a `follow` or `repost` as though the activity came from a different account. This permits removal of an existing `follow` relationship or `repost` belonging to another account without that account's involvement. No private data is exposed and content is not modified; the affected relationships can be re-established. Services proxying to Ghost's hosted ActivityPub server have already been updated, while self-hosted services require an updated image and redeployment. This issue is fixed in version 1.2.6.

Referencias oficiales

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