CVE-2026-58593

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-01. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.5
EG Score
7.5(high)
EPSS
9.0%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 2, 2026

Advisory Details (3)

Auto-updated Jul 1, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

NodeBB - ActivityPub Author Spoofing via Unvalidated attributedTo Mapped to Local User | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nodebb-activitypub-author-spoofing-via-unvalidated-attributedto-mapped-to-local-user
generic

exploitarium/nodebb-activitypub-attributedto-local-uid-spoof-poc at main · bikini/exploitarium · GitHub

https://github.com/bikini/exploitarium/tree/main/nodebb-activitypub-attributedto-local-uid-spoof-poc
generic

NodeBB/src/activitypub/mocks.js at v4.13.2 · NodeBB/NodeBB · GitHub

https://github.com/NodeBB/NodeBB/blob/v4.13.2/src/activitypub/mocks.js

Vendor Advisories for CVE-2026-58593(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 32× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 22:02 UTCEG score recompute
  2. 2026-07-06 22:01 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 11:02 UTCEG score recompute
  6. 2026-07-06 11:02 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-06 00:03 UTCEG score recompute
  10. 2026-07-06 00:03 UTCGHSA enrichment
  11. 2026-07-05 13:03 UTCEG score recompute
  12. 2026-07-05 13:03 UTCGHSA enrichment
  13. 2026-07-05 02:31 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-05 02:05 UTCEG score recompute
  16. 2026-07-05 02:04 UTCGHSA enrichment
  17. 2026-07-04 15:05 UTCEG score recompute
  18. 2026-07-04 15:05 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-04 04:06 UTCEG score recompute
  22. 2026-07-04 04:06 UTCGHSA enrichment
  23. 2026-07-03 17:05 UTCEG score recompute
  24. 2026-07-03 17:05 UTCGHSA enrichment
  25. 2026-07-03 06:06 UTCEG score recompute
Show 7 more
  1. 2026-07-03 06:06 UTCGHSA enrichment
  2. 2026-07-02 19:05 UTCEG score recompute
  3. 2026-07-02 19:05 UTCGHSA enrichment
  4. 2026-07-02 08:06 UTCEG score recompute
  5. 2026-07-02 08:06 UTCGHSA enrichment
  6. 2026-07-01 21:08 UTCEG score recompute
  7. 2026-07-01 21:08 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58593?
CVE-2026-58593 is a high vulnerability published on July 1, 2026. 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…
When was CVE-2026-58593 disclosed?
CVE-2026-58593 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58593 actively exploited?
CVE-2026-58593 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58593?
CVE-2026-58593 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-58593?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58593, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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