CVE-2026-19607

mediumpriority · track · 10EPSS 0.007 · 52 %ileexploit · PoCDERUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.69% (52nd) EPSS

CVSS 5.3 · medium

Is it mine?

6 products

Check your exposure

Who says so?

2 sources

fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · secalert@redhat.com USexploitability 3.9 · impact 1.4

v3.15mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USCWE-287US

exploits (1)

Public proof-of-concept and weaponised exploit code.

7Ragnarok7/CVE-2026-19607Vulnerability Details and Exploit for CVE-2026-19607PoC · poc_in_github

affected products (6)

Products and version ranges known to be affected.

Open Source Keycloak <26.7.4all versionscert_bundDE
Open Source Keycloak< 26.7.4cert_bundDE
Red Hat, Inc. Red Hat Build of Keycloak≤ 26.4fstec_bduRU
Red Hat, Inc. Red Hat Build of Keycloak≤ 26.6fstec_bduRU
Red Hat, Inc. Red Hat Build of Keycloak≤ 26.4.16fstec_bduRU
Red Hat, Inc. Red Hat Build of Keycloak≤ 26.6.7fstec_bduRU

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3418Keycloak: Mehrere SchwachstellenDeutsch2026-09-16csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen und um Informationen offenzulegen.

also known as (1)

Other names and identifiers for this entity.

BDU:2026-17158 fstec_bdu

sources

Which sources assert this record, and when.

fstec_bdu cert_bund NVD CVE.org MITRE

published 2026-09-16modified 2026-10-21

references (6) nvd

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan