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 — 3 sources updated this weekElevated
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)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
9.0%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 7, 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 13× in last 7d / 72× 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. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:21 UTCEG score recompute
  4. 2026-07-22 14:08 UTCEPSS rescore
  5. 2026-07-22 14:08 UTCEPSS rescore
  6. 2026-07-21 15:25 UTCEPSS rescore
  7. 2026-07-21 15:25 UTCEPSS rescore
  8. 2026-07-20 17:08 UTCEPSS rescore
  9. 2026-07-19 14:31 UTCEPSS rescore
  10. 2026-07-19 14:31 UTCEPSS rescore
  11. 2026-07-19 02:29 UTCEPSS rescore
  12. 2026-07-18 10:04 UTCEPSS rescore
  13. 2026-07-16 23:49 UTCGHSA enrichment
  14. 2026-07-16 17:03 UTCEPSS rescore
  15. 2026-07-16 12:50 UTCGHSA enrichment
  16. 2026-07-16 01:51 UTCGHSA enrichment
  17. 2026-07-15 16:57 UTCEPSS rescore
  18. 2026-07-15 16:57 UTCEPSS rescore
  19. 2026-07-15 14:52 UTCGHSA enrichment
  20. 2026-07-15 03:50 UTCGHSA enrichment
  21. 2026-07-15 02:00 UTCEPSS rescore
  22. 2026-07-15 02:00 UTCEPSS rescore
  23. 2026-07-14 16:52 UTCGHSA enrichment
  24. 2026-07-14 05:53 UTCGHSA enrichment
  25. 2026-07-13 22:31 UTCEPSS rescore
Show 47 more
  1. 2026-07-13 18:54 UTCGHSA enrichment
  2. 2026-07-13 07:55 UTCGHSA enrichment
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-12 20:56 UTCGHSA enrichment
  6. 2026-07-12 09:55 UTCGHSA enrichment
  7. 2026-07-12 05:46 UTCEPSS rescore
  8. 2026-07-11 22:56 UTCGHSA enrichment
  9. 2026-07-11 11:58 UTCGHSA enrichment
  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-11 00:59 UTCGHSA enrichment
  13. 2026-07-10 14:00 UTCGHSA enrichment
  14. 2026-07-10 02:59 UTCGHSA enrichment
  15. 2026-07-09 19:10 UTCEPSS rescore
  16. 2026-07-09 19:10 UTCEPSS rescore
  17. 2026-07-09 16:00 UTCGHSA enrichment
  18. 2026-07-09 05:01 UTCGHSA enrichment
  19. 2026-07-08 18:02 UTCGHSA enrichment
  20. 2026-07-08 15:16 UTCEPSS rescore
  21. 2026-07-08 15:16 UTCEPSS rescore
  22. 2026-07-08 07:00 UTCGHSA enrichment
  23. 2026-07-07 19:59 UTCGHSA enrichment
  24. 2026-07-07 13:46 UTCEPSS rescore
  25. 2026-07-07 13:46 UTCEPSS rescore
  26. 2026-07-07 09:00 UTCGHSA enrichment
  27. 2026-07-06 22:01 UTCGHSA enrichment
  28. 2026-07-06 16:27 UTCEPSS rescore
  29. 2026-07-06 16:27 UTCEPSS rescore
  30. 2026-07-06 11:02 UTCGHSA enrichment
  31. 2026-07-06 02:23 UTCEPSS rescore
  32. 2026-07-06 02:23 UTCEPSS rescore
  33. 2026-07-06 00:03 UTCGHSA enrichment
  34. 2026-07-05 13:03 UTCGHSA enrichment
  35. 2026-07-05 02:31 UTCEPSS rescore
  36. 2026-07-05 02:30 UTCEPSS rescore
  37. 2026-07-05 02:04 UTCGHSA enrichment
  38. 2026-07-04 15:05 UTCGHSA enrichment
  39. 2026-07-04 06:31 UTCEPSS rescore
  40. 2026-07-04 06:31 UTCEPSS rescore
  41. 2026-07-04 04:06 UTCGHSA enrichment
  42. 2026-07-03 17:05 UTCGHSA enrichment
  43. 2026-07-03 06:06 UTCGHSA enrichment
  44. 2026-07-02 19:05 UTCGHSA enrichment
  45. 2026-07-02 08:06 UTCGHSA enrichment
  46. 2026-07-01 21:08 UTCEG score recompute
  47. 2026-07-01 21:08 UTCNVD updatefirst tracked

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 7, 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.

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