CVE-2026-31309

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 53% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Improper authorization in the /tequilapi/config/user endpoint of Mysterium Node from v1.21.1-rc0 before v1.36.0 allows an unauthenticated attacker to arbitrarily overwrite the node's configuration and achieve a full node takeover via a crafted POST request.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 16, 2026

Advisory Details (6)

Auto-updated Aug 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

GitHub - Sch8ill/CVE-2026-31309: Improper Access Control in Mysterium Node before v1.36.0 · GitHub

https://github.com/sch8ill/CVE-2026-31309
github_commit

commit bc099fcaff59 (mysteriumnetwork/node)

Fix landed in mysteriumnetwork/node commit bc099fcaff59 — awaiting tagged release

https://github.com/mysteriumnetwork/node/commit/bc099fcaff59fee9c8a8f8e07ffff5b3c5df2bb9
generic

GitHub - mysteriumnetwork/node: Mysterium Network Node - official implementation of distributed VPN network (dVPN) protocol · GitHub

https://github.com/mysteriumnetwork/node/
github_release Patch Available

1.35.5

Patch available: mysteriumnetwork/node 1.35.5 (pre-release)

https://github.com/mysteriumnetwork/node/releases/tag/1.35.5
github_commit

commit 83051199cd64 (mysteriumnetwork/node)

Fix landed in mysteriumnetwork/node commit 83051199cd64 — awaiting tagged release

https://github.com/mysteriumnetwork/node/commit/83051199cd641dd4ed9057b958e5616df1309f19
generic

node/tequilapi/tequil/routes.go at 1.35.5 · mysteriumnetwork/node · GitHub

https://github.com/mysteriumnetwork/node/blob/1.35.5/tequilapi/tequil/routes.go#L26

Vendor Advisories for CVE-2026-31309(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 196× 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 281 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-31309?
CVE-2026-31309 is a critical vulnerability published on July 8, 2026. Improper authorization in the /tequilapi/config/user endpoint of Mysterium Node from v1.21.1-rc0 before v1.36.0 allows an unauthenticated attacker to arbitrarily overwrite the node's configuration and achieve a full node takeover via a crafted POST request.
When was CVE-2026-31309 disclosed?
CVE-2026-31309 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31309 actively exploited?
CVE-2026-31309 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.0% of all scored CVEs.
What is the CVSS score of CVE-2026-31309?
CVE-2026-31309 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-31309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31309, 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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