CVE-2026-58593

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Source
https://cve.org/CVERecord?id=CVE-2026-58593
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58593.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-58593
Published
2026-07-01T19:27:23Z
Modified
2026-08-12T03:51:12Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
NodeBB - ActivityPub Author Spoofing via Unvalidated attributedTo Mapped to Local User
Details

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.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-290",
        "CWE-345"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58593.json"
}
References

Affected packages

Git / github.com/nodebb/nodebb

Affected ranges

Type
GIT
Repo
https://github.com/nodebb/nodebb
Events
Introduced
c17e7102fb6abcc25d346efa2600fcbbbee9ab04
Last Affected
c17e7102fb6abcc25d346efa2600fcbbbee9ab04
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:nodebb:nodebb:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "4.13.2"
        },
        {
            "last_affected": "4.13.2"
        },
        {
            "introduced": "0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Affected versions

4.*
4.13.2
v4.*
v4.13.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58593.json"