CVE-2026-88863

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

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

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-10. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.1Exploit: None knownExposed services: Not assessed

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

capgo.app (npm package capgo) through version 12.207.1 does not compare the caller's role rank against the requested role in the validateInvite() function of supabase/functions/_backend/private/invite_new_user_to_org.ts. The POST /private/invite_new_user_to_org endpoint only requires the org.update_user_roles permission for org_super_admin invitations, so an authenticated user holding only the org.invite_user permission (e.g., an org_member) can invite an external user as org_admin or org_billing_admin. When the invited account accepts the invitation via POST /private/accept_invitation, ensureOrgMembership creates the role binding using the Supabase service-role key, which bypasses the prevent_role_binding_priority_escalation and check_org_user_privileges database triggers. This allows privilege escalation resulting in full administrative control over the organization's apps, channels, members, and billing. The issue is addressed by pull request #3096, which compares the inviter's rank before permitting elevated invitations.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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)
Severity81% × 45%
The EG Score, 8.1 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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 or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (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

September 10, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 10, 2026
No fix on record yet. Sources: github.
Web page

capgo.app through 12.207.1 Privilege Escalation via invite_new_user_to_org | Advisories | VulnCheck

https://www.vulncheck.com/advisories/capgo-app-through-12.207.1-privilege-escalation-via-invite-new-user-to-org
GitHub advisoryMentions a patch (unverified)

[Security] Privilege escalation in invite_new_user_to_org: org_member can invite org_admin by bypassing rank check · Advisory · Cap-go/capgo.app · GitHub

https://github.com/Cap-go/capgo.app/security/advisories/GHSA-7g7p-fxx8-4wm8

Vendor Advisories for CVE-2026-88863(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 28× in last 7d / 115× 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 127 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 27 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 22:23 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  2. 2026-10-11 19:15 UTCEG score recompute
  3. 2026-10-11 16:32 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  5. 2026-10-11 13:48 UTCEG score recompute
  6. 2026-10-11 10:16 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  7. 2026-10-10 20:11 UTCEG score recompute
  8. 2026-10-10 20:11 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  10. 2026-10-10 08:14 UTCEG score recompute
  11. 2026-10-10 08:14 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  13. 2026-10-09 19:57 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  14. 2026-10-08 23:51 UTCEG score recompute
  15. 2026-10-08 23:51 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  16. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  17. 2026-10-08 07:51 UTCEG score recompute
  18. 2026-10-08 07:51 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  19. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  20. 2026-10-07 19:55 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  21. 2026-10-07 04:21 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  22. 2026-10-06 16:26 UTCEG score recompute
  23. 2026-10-06 16:26 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  24. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  25. 2026-10-06 04:32 UTCEG score recompute
Show 75 more
  1. 2026-10-06 04:31 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  2. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  3. 2026-10-05 16:24 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  4. 2026-10-05 03:36 UTCEG score recompute
  5. 2026-10-05 03:36 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  6. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  7. 2026-10-04 15:42 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  8. 2026-10-04 03:47 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  9. 2026-10-03 15:53 UTCEG score recompute
  10. 2026-10-03 15:53 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  11. 2026-10-03 03:22 UTCEG score recompute
  12. 2026-10-03 03:22 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  13. 2026-10-02 15:27 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  14. 2026-10-02 03:28 UTCEG score recompute
  15. 2026-10-02 03:28 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  16. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  17. 2026-10-01 14:37 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  18. 2026-10-01 02:43 UTCEG score recompute
  19. 2026-10-01 02:43 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  20. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  21. 2026-09-30 14:49 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  22. 2026-09-30 02:46 UTCEG score recompute
  23. 2026-09-30 02:46 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  24. 2026-09-29 14:52 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  25. 2026-09-29 02:49 UTCEG score recompute
  26. 2026-09-29 02:49 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  27. 2026-09-28 14:54 UTCEG score recompute
  28. 2026-09-28 14:54 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  29. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  30. 2026-09-28 02:59 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  31. 2026-09-27 15:04 UTCEG score recompute
  32. 2026-09-27 15:03 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  33. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  34. 2026-09-27 02:56 UTCEG score recompute
  35. 2026-09-27 02:56 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  36. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  37. 2026-09-26 15:01 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  38. 2026-09-26 01:28 UTCEG score recompute
  39. 2026-09-26 01:28 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  40. 2026-09-25 12:40 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  41. 2026-09-25 00:46 UTCEG score recompute
  42. 2026-09-25 00:46 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  43. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  44. 2026-09-24 12:51 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  45. 2026-09-24 00:56 UTCEG score recompute
  46. 2026-09-24 00:56 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  47. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  48. 2026-09-23 13:02 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  49. 2026-09-23 01:08 UTCEG score recompute
  50. 2026-09-23 01:08 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  51. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  52. 2026-09-22 13:13 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  53. 2026-09-22 01:19 UTCEG score recompute
  54. 2026-09-22 01:19 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  55. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  56. 2026-09-21 13:24 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  57. 2026-09-21 01:30 UTCEG score recompute
  58. 2026-09-21 01:30 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  59. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  60. 2026-09-20 13:35 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  61. 2026-09-20 01:41 UTCEG score recompute
  62. 2026-09-20 01:41 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  63. 2026-09-19 13:46 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  64. 2026-09-19 01:51 UTCEG score recompute
  65. 2026-09-19 01:51 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  66. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  67. 2026-09-18 13:57 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  68. 2026-09-18 01:57 UTCEG score recompute
  69. 2026-09-18 01:57 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  70. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  71. 2026-09-17 14:03 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  72. 2026-09-17 02:09 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  73. 2026-09-16 14:15 UTCEG score recompute
  74. 2026-09-16 14:15 UTCGHSA enrichmentGHSA-9758-4f33-587j · GitHub severity HIGH · GitHub CVSS 8.1
  75. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.2% · 12th percentile

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Frequently asked(5)

What is CVE-2026-88863?
CVE-2026-88863 is a high-severity vulnerability; its CVE record was published on September 10, 2026. capgo.app (npm package capgo) through version 12.207.1 does not compare the caller's role rank against the requested role in the validateInvite() function of supabase/functions/backend/private/invitenewusertoorg.ts. The POST /private/invitenewusertoorg endpoint only requires the org.updateuserroles…
When was CVE-2026-88863 made public?
CVE-2026-88863 was made public on August 27, 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 September 10, 2026. EchelonGraph's copy of the record carries a last-modified date of September 10, 2026; the record at its source may have been updated since.
Is CVE-2026-88863 actively exploited?
CVE-2026-88863 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88863?
CVE-2026-88863 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-88863?
No fix for CVE-2026-88863 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-88863 are linked in the Vendor Advisories panel on this page.

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