CVE-2024-1249: 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.
Security readout for executives and security teams
Plain-English summary
Keycloak can be abused through its OIDC login-check iframe because cross-origin messages are not properly validated. An attacker who can induce user interaction may trigger large volumes of requests, causing availability impact against identity services and applications that depend on them.
Executive priority
High priority for organizations relying on affected Keycloak or Red Hat identity products. The main business risk is login and authentication disruption, not data theft, based on the provided CVSS and description.
Technical view
CVE-2024-1249 is CWE-346 in Keycloak OIDC checkLoginIframe. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H, reflecting unauthenticated network reachability, required user interaction, changed scope, and high availability impact.
Likely exposure
Exposure is most relevant where affected Keycloak, Red Hat build of Keycloak 22, Red Hat Single Sign-On 7.6, RH SSO containers, or listed RHOSS 1.33 packages are deployed and reachable by browsers.
Exploitation context
The bundle does not show CISA KEV listing or confirmed active exploitation. It describes a denial-of-service scenario where attackers coordinate browser-driven request volume through unvalidated cross-origin messages. Treat exploit status as unconfirmed from the provided evidence.
Researcher notes
Focus validation on origin handling around OIDC checkLoginIframe and whether deployed builds include the vendor fix. Do not assume confidentiality or integrity impact; the provided vector and description support availability impact only.
Mitigation direction
Apply the relevant Red Hat security advisory updates for deployed affected products.
Check Keycloak and Red Hat guidance for fixed versions before changing production.
Prioritize identity-provider instances exposed to users or the internet.
Review dependent applications for resilience if authentication services become unavailable.
Validation and detection
Inventory Keycloak, RH SSO, and Red Hat build of Keycloak package versions.
Compare installed packages against the affected versions listed in the CVE bundle.
Confirm whether RHSA updates 2024:1860 through 2024:4057 apply to your environment.
Validate remediation in staging before production rollout.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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cwe · low confidence lookup
CWE-346: Exact CWE lookup
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The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
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CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
CWE-346 · source CWE mapping
Origin Validation Error
Origin Validation Error represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.