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.
CVSS Score
8.7
EPSS Score
0.002
Published
2026-07-01
Cross-Site Scripting (XSS) vulnerability in NodeBB v4.0.4 and before allows remote attackers to store arbitrary code and potentially render the blacklist IP functionality unusable until content is removed via the database.
CVSS Score
6.1
EPSS Score
0.003
Published
2025-04-18
Cross-Site Scripting (XSS) vulnerability in NodeBB v4.0.4 and before allows remote attackers to store arbitrary code in the admin API Access token generator.
CVSS Score
6.1
EPSS Score
0.412
Published
2025-04-18
A persistent cross-site scripting (XSS) vulnerability in NodeBB v3.11.0 allows remote attackers to store arbitrary code in the 'about me' section of their profile.
CVSS Score
4.6
EPSS Score
0.39
Published
2025-01-24