NodeBB 4.13.2 Private Message object.id data authenticity

Summaryinfo

A vulnerability labeled as problematic has been found in NodeBB 4.13.2. This vulnerability affects unknown code of the component Private Message Handler. Such manipulation of the argument object.id leads to data authenticity. This vulnerability is documented as CVE-2026-58593. The attack can be executed remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability was found in NodeBB 4.13.2. It has been rated as problematic. Affected by this issue is an unknown part of the component Private Message Handler. The manipulation of the argument object.id with an unknown input leads to a data authenticity vulnerability. Using CWE to declare the problem leads to CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. Impacted is integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-58593 since 07/01/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• NodeBB

Version

• 4.13.2

CPE 2.3info

• 🔒

CPE 2.2info

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