CVE-2026-19607

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

Score 5.3 from GitHub Security Advisory published 2026-09-16. A secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated

Also known asEUVD-2026-80855 (ENISA EUVD) · GHSA-h87q-rx56-87wm (GitHub Security Advisories)Source: ENISA EUVD

5.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 5.3Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the first-broker-login flow of the keycloak-services component. This component handles the initial authentication and account linking when a user logs in via an external identity provider. The issue allows an attacker to register a matching username on an external provider to trigger a collision in Keycloak, which results in the legitimate user being locked out of their account.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
55
EG Risk 55/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity53% × 45%
Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.

EG Severity
5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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 16, 2026

Last Modified

September 16, 2026

Advisory Details (6)

Auto-updated Sep 16, 2026
Patch available. Sources: redhat.
Red Hat

2514529 – (CVE-2026-19607) CVE-2026-19607 keycloak-services: keycloak-services: Broker-originated username collision causes account lockout

https://bugzilla.redhat.com/show_bug.cgi?id=2514529
Red HatMentions a patch (unverified)

CVE-2026-19607 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-19607
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:68280
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:68278
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:68277
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:68276

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhbk-openshift-rhel9/rhbk-openshift-rhel92026-09-16redhat
redhatrhbk/keycloak-rhel9-operator:26.4-262026-09-16redhat
redhatrhbk/keycloak-rhel9-operator:26.6-202026-09-16redhat

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(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 65× 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 125 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 25 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  3. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  4. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  5. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  6. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  7. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  8. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  9. 2026-10-25 14:44 UTCEG score recompute
  10. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-19 17:35 UTCEG score recompute
  16. 2026-10-19 17:35 UTCVendor advisory
  17. 2026-10-19 17:35 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  18. 2026-10-19 16:39 UTCEG score recompute
  19. 2026-10-19 16:39 UTCVendor advisory
  20. 2026-10-19 16:38 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  21. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  22. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-10-18 03:58 UTCEG score recompute
  24. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-16 18:36 UTCEG score recompute
Show 75 more
  1. 2026-10-16 18:36 UTCVendor advisory
  2. 2026-10-16 18:36 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  3. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  4. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-10-12 16:25 UTCEG score recompute
  9. 2026-10-11 20:06 UTCEG score recompute
  10. 2026-10-11 17:19 UTCEG score recompute
  11. 2026-10-11 14:51 UTCEG score recompute
  12. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-11 03:49 UTCEG score recompute
  14. 2026-10-11 03:49 UTCVendor advisory
  15. 2026-10-11 03:49 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  16. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-10-10 00:43 UTCEG score recompute
  18. 2026-10-10 00:43 UTCVendor advisory
  19. 2026-10-10 00:43 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  20. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-10-08 23:24 UTCEG score recompute
  22. 2026-10-08 23:24 UTCVendor advisory
  23. 2026-10-08 23:24 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  24. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  26. 2026-10-07 22:05 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  27. 2026-10-06 20:41 UTCEG score recompute
  28. 2026-10-06 20:41 UTCVendor advisory
  29. 2026-10-06 20:41 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  30. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  31. 2026-10-05 19:23 UTCEG score recompute
  32. 2026-10-05 19:23 UTCVendor advisory
  33. 2026-10-05 19:23 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  34. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  35. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  36. 2026-10-04 18:04 UTCVendor advisory
  37. 2026-10-04 18:04 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  38. 2026-10-03 16:45 UTCEG score recompute
  39. 2026-10-03 16:45 UTCVendor advisory
  40. 2026-10-03 16:45 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  41. 2026-10-02 15:27 UTCEG score recompute
  42. 2026-10-02 15:27 UTCVendor advisory
  43. 2026-10-02 15:27 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  44. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  45. 2026-10-01 14:05 UTCEG score recompute
  46. 2026-10-01 14:05 UTCVendor advisory
  47. 2026-10-01 14:05 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  48. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  49. 2026-09-30 12:48 UTCEG score recompute
  50. 2026-09-30 12:48 UTCVendor advisory
  51. 2026-09-30 12:48 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  52. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  53. 2026-09-29 11:29 UTCEG score recompute
  54. 2026-09-29 11:29 UTCVendor advisory
  55. 2026-09-29 11:29 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  56. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  57. 2026-09-28 10:11 UTCEG score recompute
  58. 2026-09-28 10:11 UTCVendor advisory
  59. 2026-09-28 10:11 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  60. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  61. 2026-09-27 08:52 UTCEG score recompute
  62. 2026-09-27 08:52 UTCVendor advisory
  63. 2026-09-27 08:52 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  64. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  65. 2026-09-26 07:35 UTCEG score recompute
  66. 2026-09-26 07:35 UTCVendor advisory
  67. 2026-09-26 07:35 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  68. 2026-09-25 06:13 UTCEG score recompute
  69. 2026-09-25 06:13 UTCVendor advisory
  70. 2026-09-25 06:13 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  71. 2026-09-24 04:55 UTCEG score recompute
  72. 2026-09-24 04:55 UTCVendor advisory
  73. 2026-09-24 04:55 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
  74. 2026-09-23 03:37 UTCEG score recompute
  75. 2026-09-23 03:37 UTCVendor advisory

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 GitHub PoC). Defenders should treat patch urgency accordingly.

  • GitHub PoC7Ragnarok7/CVE-2026-19607
    Published Aug 8, 2026

    Vulnerability Details and Exploit for CVE-2026-19607

    Open source ↗

Frequently asked(5)

What is CVE-2026-19607?
CVE-2026-19607 is a medium-severity vulnerability; its CVE record was published on September 16, 2026. A flaw was found in the first-broker-login flow of the keycloak-services component. This component handles the initial authentication and account linking when a user logs in via an external identity provider. The issue allows an attacker to register a matching username on an external provider to…
When was CVE-2026-19607 made public?
CVE-2026-19607 was made public on September 16, 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 September 16, 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-2026-19607 actively exploited?
CVE-2026-19607 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19607?
CVE-2026-19607 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19607?
A fix for CVE-2026-19607 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-19607 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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