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CVE-2026-58593— NodeBB - ActivityPub Author Spoofing via Unvalidated attributedTo Mapped to Local User

CVSS 7.5 · High EPSS 0.19% · P8

Affected Version Matrix 1

VendorProductVersion RangeStatus
NodeBBNodeBB4.13.2affected
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I. Basic Information for CVE-2026-58593

Vulnerability Information
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Vulnerability Title
NodeBB - ActivityPub Author Spoofing via Unvalidated attributedTo Mapped to Local User
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对数据真实性的验证不充分
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
NodeBBNodeBB 4.13.2 -

II. Public POCs for CVE-2026-58593

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 13235 chars
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III. Intelligence Information for CVE-2026-58593

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Vendor Advisories for CVE-2026-58593 (1)

Proof of Concept for CVE-2026-58593 (1)

IV. Related Vulnerabilities

Same product: NodeBB
Same vendor: NodeBB
Same weakness: CWE-345

V. Comments for CVE-2026-58593

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