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
“—” 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.
Also known asEUVD-2026-80855 (ENISA EUVD) · GHSA-h87q-rx56-87wm (GitHub Security Advisories)Source: ENISA EUVD
- Public exploit or proof-of-concept code is available
A fix is available — apply it.
- CVSS v3
- 5.3
- EG Score
- 5.3MEDIUMmedium confidence
- EG Risk
- 55EG 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, 20262514529 – (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=2514529CVE-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-2026-19607Vendor Advisories for CVE-2026-19607(5)
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-2026:68276Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat build of Keycloak 26.4.16 Images Security Update
- RHSA-2026:68277Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat build of Keycloak 26.6.7 Images Security Update
- 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 | Fix (by version range) / 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.
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.
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-25 14:44 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-19 17:35 UTCEG score recompute
- 2026-10-19 17:35 UTCVendor advisory
- 2026-10-19 17:35 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-19 16:39 UTCEG score recompute
- 2026-10-19 16:39 UTCVendor advisory
- 2026-10-19 16:38 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-18 03:58 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-16 18:36 UTCEG score recompute
Show 75 moreShow fewer
- 2026-10-16 18:36 UTCVendor advisory
- 2026-10-16 18:36 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-12 16:25 UTCEG score recompute
- 2026-10-11 20:06 UTCEG score recompute
- 2026-10-11 17:19 UTCEG score recompute
- 2026-10-11 14:51 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-11 03:49 UTCEG score recompute
- 2026-10-11 03:49 UTCVendor advisory
- 2026-10-11 03:49 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-10 00:43 UTCEG score recompute
- 2026-10-10 00:43 UTCVendor advisory
- 2026-10-10 00:43 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-08 23:24 UTCEG score recompute
- 2026-10-08 23:24 UTCVendor advisory
- 2026-10-08 23:24 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-07 22:05 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-06 20:41 UTCEG score recompute
- 2026-10-06 20:41 UTCVendor advisory
- 2026-10-06 20:41 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-05 19:23 UTCEG score recompute
- 2026-10-05 19:23 UTCVendor advisory
- 2026-10-05 19:23 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-04 18:04 UTCVendor advisory
- 2026-10-04 18:04 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-03 16:45 UTCEG score recompute
- 2026-10-03 16:45 UTCVendor advisory
- 2026-10-03 16:45 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-02 15:27 UTCEG score recompute
- 2026-10-02 15:27 UTCVendor advisory
- 2026-10-02 15:27 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-01 14:05 UTCEG score recompute
- 2026-10-01 14:05 UTCVendor advisory
- 2026-10-01 14:05 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-09-30 12:48 UTCEG score recompute
- 2026-09-30 12:48 UTCVendor advisory
- 2026-09-30 12:48 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-29 11:29 UTCEG score recompute
- 2026-09-29 11:29 UTCVendor advisory
- 2026-09-29 11:29 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-28 10:11 UTCEG score recompute
- 2026-09-28 10:11 UTCVendor advisory
- 2026-09-28 10:11 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-27 08:52 UTCEG score recompute
- 2026-09-27 08:52 UTCVendor advisory
- 2026-09-27 08:52 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-26 07:35 UTCEG score recompute
- 2026-09-26 07:35 UTCVendor advisory
- 2026-09-26 07:35 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-09-25 06:13 UTCEG score recompute
- 2026-09-25 06:13 UTCVendor advisory
- 2026-09-25 06:13 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-09-24 04:55 UTCEG score recompute
- 2026-09-24 04:55 UTCVendor advisory
- 2026-09-24 04:55 UTCGHSA enrichmentGHSA-h87q-rx56-87wm · GitHub CVSS 5.3
- 2026-09-23 03:37 UTCEG score recompute
- 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-2026-19607Published Aug 8, 2026
Vulnerability Details and Exploit for CVE-2026-19607
Open source ↗
Related CVEs(same vendor + same CWE)
Same vendor
10 shownredhat:RHSA-2026:68276 · redhat:RHSA-2026:68277
Frequently asked(5)
What is CVE-2026-19607?
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What is the CVSS score of CVE-2026-19607?
How do I remediate CVE-2026-19607?
Dependency Blast Radius
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