CVE-2026-18639

HIGHPre-NVD 7.37.3
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: None knownExposed: 0

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

When Velociraptor is configured to use an OIDC IdP for authentication, it uses the email claim as a username. However, some IdP allow users to change the email claim without verification. Some IdPs do not set the "email_verified" claim and do not actually verify the email.

This allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover.

CVSS v3
7.3
EG Score
7.3(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: Track

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
Severity73% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
No patch confirmed yet.
generic

CVE-2026-18639 Velociraptor OIDC Authenticator susceptible to email …

http://docs.velociraptor.app/announcements/advisories/cve-2026-18639/

Vendor Advisories for CVE-2026-18639(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 22× in last 7d / 105× 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 144 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-18639?
CVE-2026-18639 is a high vulnerability published on August 11, 2026. When Velociraptor is configured to use an OIDC IdP for authentication, it uses the email claim as a username. However, some IdP allow users to change the email claim without verification. Some IdPs do not set the "email_verified" claim and do not actually verify the email. This allows a user to…
When was CVE-2026-18639 disclosed?
CVE-2026-18639 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18639 actively exploited?
CVE-2026-18639 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 81.6% of all scored CVEs.
What is the CVSS score of CVE-2026-18639?
CVE-2026-18639 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-18639?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18639, 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

Explore the affected products and dependency analysis for CVE-2026-18639

Explore →

Is Your Infrastructure Affected by CVE-2026-18639?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.