CVE-2026-16108

MEDIUMNVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.4% (29th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 4.3 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-07-17) is not newer than that change (2026-09-16), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the default-groups REST endpoint and realm representation of Keycloak. This component is responsible for managing groups that are automatically assigned to new users within a realm. The issue allows a delegated administrator with realm-viewing permissions to see the names and identifiers of hidden default groups, even if they lack the specific permissions to view those groups. This can lead to the exposure of sensitive organizational structures or internal group names.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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)
Severity65% × 45%
The EG Score, 6.5 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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

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

July 17, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Jul 17, 2026
Patch available. Sources: redhat.
Red Hat

2501740 – (CVE-2026-16108) CVE-2026-16108 keycloak-services: keycloak-services: Realm default-group reads disclose hidden groups under FGAP v2

https://bugzilla.redhat.com/show_bug.cgi?id=2501740
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-16108

Vendor Advisories for CVE-2026-16108(3)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.6-202026-09-16redhat
redhatrhbk-openshift-rhel9/rhbk-openshift-rhel92026-09-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 44× 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 186 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 86 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  2. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-10-12 16:30 UTCEG score recompute
  4. 2026-10-11 20:09 UTCEG score recompute
  5. 2026-10-11 17:21 UTCEG score recompute
  6. 2026-10-11 14:54 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  8. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  9. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  10. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  17. 2026-10-01 10:28 UTCEG score recompute
  18. 2026-10-01 10:28 UTCVendor advisory
  19. 2026-10-01 10:28 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  20. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-09-28 07:53 UTCEG score recompute
  24. 2026-09-28 07:53 UTCVendor advisory
  25. 2026-09-28 07:53 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
Show 75 more
  1. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-09-24 04:35 UTCEG score recompute
  4. 2026-09-24 04:35 UTCVendor advisory
  5. 2026-09-24 04:35 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  6. 2026-09-23 02:26 UTCEG score recompute
  7. 2026-09-23 02:26 UTCVendor advisory
  8. 2026-09-23 02:26 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  9. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  10. 2026-09-18 04:32 UTCEG score recompute
  11. 2026-09-18 04:32 UTCVendor advisory
  12. 2026-09-18 04:32 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  13. 2026-09-16 19:21 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  14. 2026-09-16 18:41 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  15. 2026-09-16 17:11 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  16. 2026-09-16 15:55 UTCEG score recompute
  17. 2026-09-16 15:55 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  18. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  19. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  20. 2026-09-14 03:16 UTCEG score recompute
  21. 2026-09-14 03:16 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  22. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  23. 2026-09-13 05:15 UTCEG score recompute
  24. 2026-09-13 05:15 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  25. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  26. 2026-09-11 21:06 UTCEG score recompute
  27. 2026-09-11 21:06 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  28. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  29. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  30. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  31. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  32. 2026-09-08 00:00 UTCEG score recompute
  33. 2026-09-08 00:00 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  34. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  35. 2026-09-06 18:53 UTCEG score recompute
  36. 2026-09-06 18:53 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  37. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  38. 2026-09-05 20:26 UTCEG score recompute
  39. 2026-09-05 20:26 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  40. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  41. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  42. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  43. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  44. 2026-08-31 15:39 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  45. 2026-08-31 10:18 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  46. 2026-08-31 01:19 UTCEG score recompute
  47. 2026-08-31 01:19 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  48. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  49. 2026-08-30 03:17 UTCEG score recompute
  50. 2026-08-30 03:17 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  51. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  52. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  53. 2026-08-27 12:13 UTCEG score recompute
  54. 2026-08-27 12:13 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  55. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  56. 2026-08-26 11:55 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  57. 2026-08-25 11:35 UTCEG score recompute
  58. 2026-08-25 11:35 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  59. 2026-08-24 13:34 UTCEG score recompute
  60. 2026-08-24 13:34 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  61. 2026-08-23 15:33 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  62. 2026-08-22 17:32 UTCEG score recompute
  63. 2026-08-22 17:32 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  64. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  65. 2026-08-21 19:30 UTCEG score recompute
  66. 2026-08-21 19:30 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  67. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  68. 2026-08-20 21:29 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  69. 2026-08-19 23:28 UTCEG score recompute
  70. 2026-08-19 23:28 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  71. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  72. 2026-08-18 19:54 UTCEG score recompute
  73. 2026-08-18 19:54 UTCGHSA enrichmentGHSA-mvwh-6438-3v8w · GitHub CVSS 4.3
  74. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  75. 2026-08-17 17:16 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-16108?
CVE-2026-16108 is a medium-severity vulnerability; its CVE record was published on July 17, 2026. A flaw was found in the default-groups REST endpoint and realm representation of Keycloak. This component is responsible for managing groups that are automatically assigned to new users within a realm. The issue allows a delegated administrator with realm-viewing permissions to see the names and…
When was CVE-2026-16108 made public?
CVE-2026-16108 was made public on July 15, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 17, 2026. EchelonGraph's copy of the record carries a last-modified date of September 16, 2026; the record at its source may have been updated since.
Is CVE-2026-16108 actively exploited?
CVE-2026-16108 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16108?
CVE-2026-16108 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-16108?
A fix for CVE-2026-16108 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-16108 are linked in the Vendor Advisories panel on this page.

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