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CVE-2024-1249

Keycloak: org.keycloak.protocol.oidc: unvalidated cross-origin messages in checkloginiframe leads to ddos

7.4 HighFix available

A flaw was found in Keycloak's OIDC component in the "checkLoginIframe," which allows unvalidated cross-origin messages. This flaw allows attackers to coordinate and send millions of requests in seconds using simple code, significantly impacting the application's availability without proper origin validation for incoming messages.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.45%Up 0.4 points since Apr 18, 2024
90%50%10%1%

What each source reports

CVE List Score used 7.4

Keycloak: org.keycloak.protocol.oidc: unvalidated cross-origin messages in checkloginiframe leads to ddos

A flaw was found in Keycloak's OIDC component in the "checkLoginIframe," which allows unvalidated cross-origin messages. This flaw allows attackers to coordinate and send millions of requests in seconds using simple code, significantly impacting the application's availability without proper origin validation for incoming messages.

Record
CVE-2024-1249
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
Weakness
CWE-346
Updated
2026-11-04
EUVDEUVD-2024-1243 7.4

A flaw was found in Keycloak's OIDC component in the "checkLoginIframe," which allows unvalidated cross-origin messages. This flaw allows attackers to coordinate and send millions of requests in seconds using simple code, significantly impacting the application's availability without proper origin validation for incoming messages.

Record
EUVD-2024-1243
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
Updated
2026-11-04
GitHub AdvisoriesGHSA-m6q9-p373-g5q8 7.4

Keycloak's unvalidated cross-origin messages in checkLoginIframe leads to DDoS

A potential security flaw in the "checkLoginIframe" which allows unvalidated cross-origin messages, enabling potential DDoS attacks. By exploiting this vulnerability, attackers could coordinate to send millions of requests in seconds using simple code, significantly impacting the application's availability without proper origin validation for incoming messages.

Acknowledgements

Special thanks to Adriano Márcio Monteiro from BRZTEC for reporting this issue and helping us improve our project.

Record
GHSA-m6q9-p373-g5q8
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
Weakness
CWE-346
Updated
2026-11-02
NVD 7.4

A flaw was found in Keycloak's OIDC component in the "checkLoginIframe," which allows unvalidated cross-origin messages. This flaw allows attackers to coordinate and send millions of requests in seconds using simple code, significantly impacting the application's availability without proper origin validation for incoming messages.

Record
CVE-2024-1249
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
Weakness
CWE-346
Updated
2026-11-04
OSV 7.4

Keycloak: org.keycloak.protocol.oidc: unvalidated cross-origin messages in checkloginiframe leads to ddos

A flaw was found in Keycloak's OIDC component in the "checkLoginIframe," which allows unvalidated cross-origin messages. This flaw allows attackers to coordinate and send millions of requests in seconds using simple code, significantly impacting the application's availability without proper origin validation for incoming messages.

Record
CVE-2024-1249
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
Weakness
CWE-346
Updated
2026-11-05
OSVGHSA-m6q9-p373-g5q8 7.4

Keycloak's unvalidated cross-origin messages in checkLoginIframe leads to DDoS

A potential security flaw in the "checkLoginIframe" which allows unvalidated cross-origin messages, enabling potential DDoS attacks. By exploiting this vulnerability, attackers could coordinate to send millions of requests in seconds using simple code, significantly impacting the application's availability without proper origin validation for incoming messages.

Acknowledgements

Special thanks to Adriano Márcio Monteiro from BRZTEC for reporting this issue and helping us improve our project.

Record
GHSA-m6q9-p373-g5q8
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
Weakness
CWE-346
Updated
2026-11-02
OSVRHSA-2024:1860 8.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.8 enhancement and security update on RHEL 7

Record
RHSA-2024:1860
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVRHSA-2024:1861 8.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.8 security update on RHEL 8

Record
RHSA-2024:1861
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVRHSA-2024:1862 8.1

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.8 security update on RHEL 9

Record
RHSA-2024:1862
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Updated
2026-11-02

Affected products

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Affected packages

Affected packages
PackageAffectedFixed
org.keycloak:keycloak-services
Maven
 before 22.0.10
22.0.10
org.keycloak:keycloak-services
Maven
 23.0.0 up to 24.0.3
24.0.3
org.keycloak:keycloak-services
Maven
 before 22.0.10, plus listed versions
1.0-alpha-11.0-alpha-1-120620131.0-alpha-21.0-alpha-31.0-alpha-4
Show 45 moreShow less
1.0-beta-11.0-beta-1-201505211.0-beta-1-201505231.0-beta-21.0-beta-31.0-beta-41.0-final1.0-rc-11.0-rc-21.0.1.Final1.0.2.Final1.0.3.Final1.0.4.Final1.0.5.Final1.1.0.Beta11.1.0.Beta21.1.0.Final1.1.1.Final1.2.0.Beta11.2.0.CR11.2.0.Final1.3.0.Final1.3.1.Final1.4.0.Final1.5.0-Final1.5.0.Final1.5.1.Final1.6.0.Final1.6.1.Final1.7.0.CR11.7.0.Final1.8.0.Alpha11.8.0.CR11.8.0.CR21.8.0.CR31.8.0.Final1.8.1.Final1.9.0.CR11.9.0.Final1.9.1.Final1.9.2.Final1.9.3.Final1.9.4.Final1.9.5.Final1.9.7.Final
22.0.10
org.keycloak:keycloak-services
Maven
 23.0.0 up to 24.0.3, plus listed versions
23.0.123.0.223.0.323.0.423.0.5
Show 5 moreShow less
23.0.623.0.724.0.024.0.124.0.2
24.0.3
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el7
From an advisory covering 5 CVEs
 before 0:18.0.13-1.redhat_00001.1.el7sso
0:18.0.13-1.redhat_00001.1.el7sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el7
From an advisory covering 5 CVEs
 before 0:18.0.13-1.redhat_00001.1.el7sso
0:18.0.13-1.redhat_00001.1.el7sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el8
From an advisory covering 5 CVEs
 before 0:18.0.13-1.redhat_00001.1.el8sso
0:18.0.13-1.redhat_00001.1.el8sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el8
From an advisory covering 5 CVEs
 before 0:18.0.13-1.redhat_00001.1.el8sso
0:18.0.13-1.redhat_00001.1.el8sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el9
From an advisory covering 5 CVEs
 before 0:18.0.13-1.redhat_00001.1.el9sso
0:18.0.13-1.redhat_00001.1.el9sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el9
From an advisory covering 5 CVEs
 before 0:18.0.13-1.redhat_00001.1.el9sso
0:18.0.13-1.redhat_00001.1.el9sso

History

History
RecordedChangedSources
affectedEUVD, NVD, OSV
factsCVE List
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-1249 is a high vulnerability (CVSS 7.4) in Red Hat Migration Toolkit For Applications 6, published April 17, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in org.keycloak:keycloak-services 22.0.10.

References

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