CVE-2026-58593

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 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(medium)
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 PROB
0%
EPSS %ILE
21%
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 21× in last 7d / 112× 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.

Showing the most recent 100 of 196 total refreshes for this CVE.

  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-25 07:57 UTCGHSA enrichment
  4. 2026-08-24 20:58 UTCEG score recompute
  5. 2026-08-24 20:58 UTCGHSA enrichment
  6. 2026-08-24 04:52 UTCGHSA enrichment
  7. 2026-08-23 17:50 UTCGHSA enrichment
  8. 2026-08-23 06:52 UTCEG score recompute
  9. 2026-08-23 06:51 UTCGHSA enrichment
  10. 2026-08-23 00:19 UTCEPSS rescore
  11. 2026-08-22 19:53 UTCGHSA enrichment
  12. 2026-08-22 06:58 UTCEG score recompute
  13. 2026-08-22 06:58 UTCGHSA enrichment
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 15:29 UTCGHSA enrichment
  16. 2026-08-21 04:30 UTCEG score recompute
  17. 2026-08-21 04:30 UTCGHSA enrichment
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-20 15:53 UTCGHSA enrichment
  20. 2026-08-20 04:36 UTCEG score recompute
  21. 2026-08-20 04:36 UTCGHSA enrichment
  22. 2026-08-19 17:04 UTCEPSS rescore
  23. 2026-08-19 07:57 UTCGHSA enrichment
  24. 2026-08-18 20:57 UTCEG score recompute
  25. 2026-08-18 20:57 UTCGHSA enrichment
Show 75 more
  1. 2026-08-18 13:48 UTCEPSS rescore
  2. 2026-08-18 04:47 UTCGHSA enrichment
  3. 2026-08-17 14:52 UTCEG score recompute
  4. 2026-08-17 14:52 UTCGHSA enrichment
  5. 2026-08-17 13:47 UTCEPSS rescore
  6. 2026-08-17 03:54 UTCGHSA enrichment
  7. 2026-08-16 16:55 UTCEG score recompute
  8. 2026-08-16 16:55 UTCGHSA enrichment
  9. 2026-08-16 14:56 UTCEPSS rescore
  10. 2026-08-16 05:57 UTCEG score recompute
  11. 2026-08-16 05:57 UTCGHSA enrichment
  12. 2026-08-16 02:14 UTCEPSS rescore
  13. 2026-08-15 18:59 UTCGHSA enrichment
  14. 2026-08-15 08:00 UTCGHSA enrichment
  15. 2026-08-14 19:52 UTCGHSA enrichment
  16. 2026-08-14 08:53 UTCEG score recompute
  17. 2026-08-14 08:53 UTCGHSA enrichment
  18. 2026-08-13 22:00 UTCEPSS rescore
  19. 2026-08-13 21:54 UTCGHSA enrichment
  20. 2026-08-13 10:56 UTCGHSA enrichment
  21. 2026-08-12 23:58 UTCEG score recompute
  22. 2026-08-12 23:58 UTCGHSA enrichment
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-12 12:59 UTCGHSA enrichment
  25. 2026-08-12 02:01 UTCGHSA enrichment
  26. 2026-08-11 15:02 UTCEG score recompute
  27. 2026-08-11 15:02 UTCGHSA enrichment
  28. 2026-08-11 04:04 UTCEG score recompute
  29. 2026-08-11 04:04 UTCGHSA enrichment
  30. 2026-08-11 00:00 UTCEPSS rescore
  31. 2026-08-10 17:05 UTCGHSA enrichment
  32. 2026-08-10 06:06 UTCGHSA enrichment
  33. 2026-08-09 19:07 UTCEG score recompute
  34. 2026-08-09 19:07 UTCGHSA enrichment
  35. 2026-08-09 13:46 UTCEPSS rescore
  36. 2026-08-09 08:09 UTCGHSA enrichment
  37. 2026-08-08 21:11 UTCEG score recompute
  38. 2026-08-08 21:11 UTCGHSA enrichment
  39. 2026-08-08 16:37 UTCEPSS rescore
  40. 2026-08-08 10:12 UTCGHSA enrichment
  41. 2026-08-07 23:14 UTCEG score recompute
  42. 2026-08-07 23:14 UTCGHSA enrichment
  43. 2026-08-07 12:15 UTCGHSA enrichment
  44. 2026-08-07 01:17 UTCGHSA enrichment
  45. 2026-08-06 14:19 UTCEG score recompute
  46. 2026-08-06 14:19 UTCGHSA enrichment
  47. 2026-08-06 13:47 UTCEPSS rescore
  48. 2026-08-06 03:18 UTCEG score recompute
  49. 2026-08-06 03:18 UTCGHSA enrichment
  50. 2026-08-05 19:17 UTCEPSS rescore
  51. 2026-08-05 16:20 UTCGHSA enrichment
  52. 2026-08-05 01:32 UTCEG score recompute
  53. 2026-08-05 01:32 UTCGHSA enrichment
  54. 2026-08-04 15:10 UTCEPSS rescore
  55. 2026-08-04 14:27 UTCEG score recompute
  56. 2026-08-04 14:27 UTCGHSA enrichment
  57. 2026-08-04 10:39 UTCEPSS rescore
  58. 2026-08-04 01:15 UTCGHSA enrichment
  59. 2026-08-03 14:17 UTCEG score recompute
  60. 2026-08-03 14:17 UTCGHSA enrichment
  61. 2026-08-03 10:36 UTCEPSS rescore
  62. 2026-08-03 03:18 UTCGHSA enrichment
  63. 2026-08-02 16:19 UTCGHSA enrichment
  64. 2026-08-02 05:20 UTCEG score recompute
  65. 2026-08-02 05:20 UTCGHSA enrichment
  66. 2026-08-02 02:27 UTCEPSS rescore
  67. 2026-08-01 18:22 UTCGHSA enrichment
  68. 2026-08-01 07:23 UTCEG score recompute
  69. 2026-08-01 07:23 UTCGHSA enrichment
  70. 2026-08-01 04:16 UTCEPSS rescore
  71. 2026-07-31 20:09 UTCGHSA enrichment
  72. 2026-07-31 09:07 UTCGHSA enrichment
  73. 2026-07-30 22:07 UTCEG score recompute
  74. 2026-07-30 22:06 UTCGHSA enrichment
  75. 2026-07-30 16:28 UTCEPSS rescore

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 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 0% probability of exploitation in the next 30 days, which ranks it in the top 79.0% of all scored CVEs.
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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