Is CVE-2026-104445 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-104445?

CVE-2026-104445 has a CVSS v3 severity of HIGH (8.2).

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CVE-2026-104445

Description

YesWiki before 4.6.7 contains an authentication bypass vulnerability in the ActivityPub inbox that fails to bind the verified HTTP signature signer to the activity actor. Unauthenticated attackers with any ActivityPub keypair can send signed Delete or Update activities referencing a mirrored entry's sourceUrl to delete or overwrite other actors' federated entries.