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.
CVE-2026-19607
MEDIUMPre-NVD 5.35.3—Trending — Patch released this week
EchelonGraph scoreHIGH confidence
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, ghsa, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: None knownExposed: 0
A fix is available — apply it.
- CVSS v3
- 5.3
- EG Score
- 5.3(high)
- EG Risk
- 39(Track)EG Risk 39/100SSVC: 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 computedSeverity53% × 45%Exploitation1% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 42%
- KEV
- Not listed
Published
September 16, 2026
Last Modified
September 16, 2026
Advisory Details (6)
Auto-updated Sep 16, 2026Patch available. Sources: redhat.
redhat
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=2514529redhat Patch Available
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-2026-19607redhat Patch Available
redhat Patch Available
redhat Patch Available
redhat Patch Available
Vendor Advisories for CVE-2026-19607(3)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- GHSA-h87q-rx56-87wmGitHub Security AdvisoriesMedium
A flaw was found in the first-broker-login flow of the keycloak-services component. This...
- RHSA-2026:68280Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat build of Keycloak 26.4.16 Security Update
- RHSA-2026:68278Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat build of Keycloak 26.6.7 Security Update
Patch Availability(3)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | rhbk-openshift-rhel9/rhbk-openshift-rhel9 | 2026-09-16 | redhat |
| redhat | rhbk/keycloak-rhel9-operator:26.4-26 | 2026-09-16 | redhat |
| redhat | rhbk/keycloak-rhel9-operator:26.6-20 | 2026-09-16 | redhat |
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.
Additional Vendor Advisories
(2)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
Data Freshness Timeline
(refreshed 15× in last 7d / 15× 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.
- 2026-09-18 22:23 UTCEG score recompute
- 2026-09-18 22:23 UTCVendor advisory
- 2026-09-18 22:23 UTCGHSA enrichment
- 2026-09-18 19:27 UTCEPSS rescore
- 2026-09-17 21:05 UTCEG score recompute
- 2026-09-17 21:05 UTCVendor advisory
- 2026-09-17 21:05 UTCGHSA enrichment
- 2026-09-16 19:45 UTCGHSA enrichment
- 2026-09-16 19:25 UTCEG score recompute
- 2026-09-16 19:25 UTCGHSA enrichment
- 2026-09-16 18:41 UTCEG score recompute
- 2026-09-16 18:41 UTCGHSA enrichment
- 2026-09-16 16:25 UTCEG score recompute
- 2026-09-16 15:50 UTCEG score recompute
- 2026-09-16 15:49 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-19607?
CVE-2026-19607 is a medium vulnerability 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 disclosed?
CVE-2026-19607 was first published in the National Vulnerability Database on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19607 actively exploited?
CVE-2026-19607 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.8% of all scored CVEs.
What is the CVSS score of CVE-2026-19607?
CVE-2026-19607 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-19607?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19607, 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.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-19607
Is Your Infrastructure Affected by CVE-2026-19607?
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