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CVE-2026-116208: Php Activitypub Sync Missing Entry Ownership Checkcve-2026-116208-php-activitypub-sync-missing-entry-ownership-check

A remote ActivityPub activity replayed by the outbox-sync loop mutates a mirrored local entry (EntryManager delete/update/create) after resolving the actor-controlled object ID to a local entry via a source-URL triple lookup, without verifying that the syncing actor owns that entry. A malicious or compromised remote server can serve a poisoned outbox so that

PHPCVE-2026-116208 GHSA-RM6R-GRFG-4V78 CWE-639 CWE-862

by Provallyupdated 2026-10-27Apache-2.0

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