CVE-2026-56223

HIGHPre-NVD 8.78.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (32nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this weekElevated
8.7EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.7Exploit: No code on recordExposed services: Not assessed

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

The CVE record's CNA (VulnCheck) lists Capgo versions before 12.128.2 as affected, and Capgo versions 12.128.2 as unaffected. No release containing a fix is confirmed on record.

Capgo before 12.128.2 contains a cross-domain SSO account takeover vulnerability in the provision-user endpoint that allows attackers to merge arbitrary victim accounts based on email match without validating SSO provider domain authorization. An attacker with enterprise org admin access and a malicious IdP can forge SAML assertions containing victim email addresses to trigger account merge and gain full access to victim accounts, organizations, and data.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
55
EG Risk 55/100

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 (value × EchelonGraph’s weight)
Severity87% × 45%
The EG Score, 8.7 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system within your standard update timelines, and watch for a fix.
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system within your standard update timelines, and watch for a fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 24, 2026

Last Modified

September 17, 2026

Advisory Details (2)

Auto-updated Jun 24, 2026
No fix on record yet. Sources: github.
GitHub advisoryMentions a patch (unverified)

Cross-Domain SSO Email Assertion Allows Account Takeover via Identity Merge in provision-user · Advisory · Cap-go/capgo · GitHub

https://github.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fg
Web page

Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user | Advisories | VulnCheck

https://www.vulncheck.com/advisories/capgo-account-takeover-via-cross-domain-sso-email-assertion-in-provision-user

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 36× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 157 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 57 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  2. 2026-10-14 05:54 UTCOSV refresh
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  5. 2026-10-12 15:55 UTCEG score recompute
  6. 2026-10-11 19:38 UTCEG score recompute
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  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 31st percentile
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  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 31st percentile
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  1. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  2. 2026-09-23 11:49 UTCEG score recompute
  3. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
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  5. 2026-09-18 08:15 UTCEG score recompute
  6. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  7. 2026-09-17 18:27 UTCEG score recompute
  8. 2026-09-17 18:16 UTCEG score recompute
  9. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  11. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  12. 2026-09-14 01:58 UTCEG score recompute
  13. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  14. 2026-09-13 12:11 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  17. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
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  22. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  23. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  24. 2026-08-30 20:21 UTCEG score recompute
  25. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  26. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  27. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  28. 2026-08-28 04:51 UTCEG score recompute
  29. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  30. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  31. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  32. 2026-08-24 22:02 UTCEG score recompute
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  34. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 15th percentile
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  36. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
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  38. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 15th percentile
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  40. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  41. 2026-08-19 02:20 UTCEG score recompute
  42. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  43. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  44. 2026-08-16 18:31 UTCEG score recompute
  45. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 15th percentile
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  47. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  48. 2026-08-15 02:23 UTCEG score recompute
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  50. 2026-08-14 00:27 UTCEG score recompute
  51. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 15th percentile
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  53. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  54. 2026-08-11 20:34 UTCEG score recompute
  55. 2026-08-11 07:36 UTCEG score recompute
  56. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  57. 2026-08-09 16:28 UTCEG score recompute
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  61. 2026-08-08 01:34 UTCEG score recompute
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  63. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
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  67. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  68. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  69. 2026-08-03 14:11 UTCEG score recompute
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  74. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  75. 2026-07-31 05:18 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-56223?
CVE-2026-56223 is a high-severity vulnerability; its CVE record was published on June 24, 2026. Capgo before 12.128.2 contains a cross-domain SSO account takeover vulnerability in the provision-user endpoint that allows attackers to merge arbitrary victim accounts based on email match without validating SSO provider domain authorization. An attacker with enterprise org admin access and a…
When was CVE-2026-56223 made public?
CVE-2026-56223 was made public on May 7, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on June 24, 2026. EchelonGraph's copy of the record carries a last-modified date of September 17, 2026; the record at its source may have been updated since.
Is CVE-2026-56223 actively exploited?
CVE-2026-56223 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56223?
CVE-2026-56223 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56223?
No fix for CVE-2026-56223 is confirmed yet. Until one is published, restrict network exposure of the affected system — for example, keep it off the internet or limit it to trusted networks — and watch for a fix. The CVE record's CNA (VulnCheck) lists Capgo versions before 12.128.2 as affected, and Capgo versions 12.128.2 as unaffected. No release containing a fix is confirmed on record.

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