CVE WatchJul 7, 2026

CVE-2026-58593

NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies

CVSS

7.5

High

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Published: Jul 1, 2026 · Last modified: Jul 7, 2026 · CWE-290 · CWE-345

EPSS · 30d

0.2%EPSS · 30 days0.3%

2026-08-102026-09-06

Technical description

NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the sender. In the object mock, attributedTo is used directly as a uid, and actors.assert silently ignores numeric identifiers (filtering them out without re-deriving the uid), so a federated remote actor can set attributedTo to a bare numeric value such as 1 and have the resulting post or private message created with that local uid as author, including the administrator account. This lets a remote attacker forge posts and direct messages attributed to arbitrary local users. Requires the ActivityPub/federation feature to be enabled.

Official references

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