CVE-2026-15571

highpriority · track · 0EPSS 0.004 · 36 %ileDENLUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.43% (36th) EPSS

CVSS 7.3 · high

Is it mine?

11 products

Check your exposure

Who says so?

3 sources

cert_bund · ncsc_nl · osv

EPSS · scored 2026-10-22

A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim's account to an attacker's external identity. This results in a full account takeover, allowing the attacker to log in as the victim.

cvss

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

7.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.7–7.3

v3.17.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondary · secalert@redhat.com USexploitability 2.1 · impact 5.2

v3.16.7mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.17.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondary · NCSC-NL NL

ssvc

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

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-341USCWE-341US

affected products (11)

Products and version ranges known to be affected.

Open Source Keycloak <26.8.0all versionscert_bundDE
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat Enterprise Linux Keycloakall versionscert_bundDEcpe:/o:redhat:enterprise_linux:keycloak
Open Source Keycloak< 26.7.2cert_bundDE
Open Source Keycloak< 26.8.0cert_bundDE
Siemens Industrial Edge Management≤ virtual <V2.9.1cert_bundDE
Siemens Industrial Edge Management< V1.15.20cert_bundDE
Siemens Industrial Edge Management< V2.2.2cert_bundDE
Red Hat Build of Keycloak≤ vers:unknown/*ncsc_nlNL
keycloak KeyCloak≤ vers:unknown/*ncsc_nlNL
Bitnami keycloak< 26.7.2osvUSpkg:bitnami/keycloak

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2026-0326Kwetsbaarheden verholpen in KeycloakNL2026-08-25csaf · ncsc_nlNL
Red Hat heeft meerdere kwetsbaarheden verholpen in Keycloak.
WID-SEC-W-2026-2915Keycloak: Mehrere SchwachstellenDeutsch2026-08-18csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um Sicherheitsvorkehrungen zu umgehen und dadurch Benutzerkonten zu übernehmen.
BIT-keycloak-2026-15571Flaw in the legacy client-initiated account-linking endpoint of Keycloak2026-08-25vendor · osvUS
A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim's account to an attacker's external identity. This results in a full account takeover, allowing the attacker to log in as the victim.

sources

Which sources assert this record, and when.

cert_bund ncsc_nl osv NVD CVE.org MITRE

published 2026-08-18modified 2026-08-20

references (4) nvd

External citations — patches, advisories, analysis.

scry

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