CVE-2026-56215

HIGHPre-NVD 8.38.3—
EchelonGraph scoreMEDIUM confidence

Score 8.3 from GitHub Security Advisory (severity: HIGH) published 2026-06-20. a secondary CVSS source baseline 8.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.3Exploit: None knownExposed: 0

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

Capgo before 12.128.12 allows authenticated users to modify their mutable public.users.email to arbitrary addresses, which the SSO provisioning endpoint trusts as an account-merge key. Attackers can pre-position their account with a victim's corporate SSO email, causing the provision-user endpoint to merge the victim's SSO identity into the attacker-controlled account.

CVSS v3
8.3
EG Score
8.3(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity83% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

June 20, 2026

Last Modified

June 24, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Capgo - Account Merge via Poisoned public.users.email in SSO Provisioning | Advisories | VulnCheck

https://www.vulncheck.com/advisories/capgo-account-merge-via-poisoned-public-users-email-in-sso-provisioning
github Patch Available🟡 PoC Available

User-controlled public.users.email can poison SSO account merge and attach victim SSO identity to attacker account · Advisory · Cap-go/capgo · GitHub

https://github.com/Cap-go/capgo/security/advisories/GHSA-wqc6-fhwf-qpww

Vendor Advisories for CVE-2026-56215(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 17× in last 7d / 99× 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 213 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56215?
CVE-2026-56215 is a high vulnerability published on June 20, 2026. Capgo before 12.128.12 allows authenticated users to modify their mutable public.users.email to arbitrary addresses, which the SSO provisioning endpoint trusts as an account-merge key. Attackers can pre-position their account with a victim's corporate SSO email, causing the provision-user endpoint…
When was CVE-2026-56215 disclosed?
CVE-2026-56215 was first published in the National Vulnerability Database on June 20, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56215 actively exploited?
CVE-2026-56215 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 68.2% of all scored CVEs.
What is the CVSS score of CVE-2026-56215?
CVE-2026-56215 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2026-56215?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56215, 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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