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CVE-2026-63115

ActivityPub Undo handler can unfollow or remove reposts on behalf of other accounts

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.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Tryghost
Products
Activitypub
CVE-2026-25552

Ghost CLI < 1.30.1 IP Spoofing via X-Forwarded-For Header

Ghost CLI before 1.30.1 contains an IP spoofing vulnerability that allows unauthenticated remote attackers to bypass rate-limiting controls by manipulating the X-Forwarded-For header through a misconfigured Nginx configuration. Attackers can append attacker-controlled values to the header chain using the $proxy_add_x_forwarded_for directive to present an arbitrary IP address, circumventing Ghost's rate-limiting mechanisms on self-hosted instances.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Ghost Tryghost
Products
Ghost Ghost-cli