CVE-2026-18963

Keycloak-services: keycloak-services: unauthenticated account takeover via reset-credentials flow bypass

A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine for identity and access management in Red Hat Build of Keycloak. The issue allows an unauthenticated attacker to force the password reset process for any user without needing to click the required email verification link. This can result in the attacker gaining full control over target user accounts by directly setting new credentials.

CVSS 3.1 · 9.1 Critical EPSS 8.1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform Expansion Pack and 4 more

CVE-2026-76166

Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram

A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted UDP multicast datagram with a valid HTTP status line and a "Server:" header but without the "Date:", "Digest:", and "Sequence:" headers triggers a NullPointerException in verifyDigest() that is not caught by the worker thread's exception handler. This causes the advertise listener thread to terminate permanently. The failure is silent (isListening() continues to return true) and persists until the node is restarted. The crash occurs before the AdvertiseSecurityKey comparison, so deployments with a configured security key are still affected.

CVSS 3.1 · 4.3 Medium EPSS 2.4% KEV · Not listed

Vendors

Redhat

Products

Jboss Enterprise Application Platform Jboss Enterprise Application Platform Expansion Pack Jboss Enterprise Web Server and 4 more

CVE-2026-18206

Keycloak-services: keycloak-services: client policy source-host wildcard domain matching bypass

A flaw was found in the keycloak-services component of Keycloak, which provides identity and access management services. The issue occurs when a realm administrator uses a wildcard domain (like *.example.com) to restrict which hosts can register or update clients. Due to improper validation, the system accepts any hostname that ends with the specified domain suffix, even if it is not a legitimate subdomain. An attacker who can control the reverse DNS of their connection can bypass these host-based restrictions, potentially allowing unauthorized client modifications.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-18208

Keycloak-services: keycloak-services: inactive out-of-audience token introspection leaks signed jwt claim

A flaw was found in the OIDC token introspection endpoint of the keycloak-services component. Keycloak is an open-source identity and access management solution used to secure modern applications and services. The issue occurs when a confidential client, configured to receive signed JWT introspection responses, attempts to introspect a token issued for a different audience. Although the endpoint correctly identifies the token as inactive for that client, it still returns the full set of token claims within a signed JWT field. This allows an unauthorized client to bypass audience-based restrictions and access sensitive information contained in the token.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-18203

Keycloak-services: keycloak-services: group policy extendchildren matches sibling group path prefixes

A flaw was found in the group policy evaluation logic of Keycloak, an identity and access management solution. When a group policy is set to extend permissions to child groups, the system incorrectly uses a simple text-based prefix check to verify group membership. This allows a user who belongs to a different group with a similar starting name to bypass security checks and gain unauthorized access to administrative functions or protected resources.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-15943

Keycloak-services: keycloak-services: oidc idp update reuses masked client secret after token url change

A flaw was found in the Keycloak keycloak-services component, which handles the management of identity providers. The issue occurs when a delegated administrator updates an OIDC identity provider using a masked client secret sentinel value. Due to improper validation, Keycloak reuses the existing real secret even if security-sensitive fields like the token URL have been changed, allowing an attacker to redirect and capture the secret.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-18217

Keycloak-services: keycloak-services: saml http-redirect binding response preserves query string leading to parameter pollution

A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and access management solution. The issue occurs when Keycloak handles SAML authentication requests using the HTTP-Redirect binding. If a client is configured with a wildcard redirect URL, an attacker can craft a request that includes malicious parameters. When a user authenticates, Keycloak appends its legitimate response to the attacker's parameters. This can cause some service providers to process the attacker's data instead of the real login information, potentially leading to a user being logged into the wrong account.

CVSS 3.1 · 3.4 Low EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-24330

Wildfly-core: wildfly: arbitrary file read via malicious archive deployment

A flaw was found in wildfly-core. A remote attacker, authenticated as a 'deployer' account, can import and deploy a malicious archive file from an untrusted source. This is achieved by leveraging WildFly libraries to craft a Java project that allows an HTTP POST request to upload and deploy the malicious archive. This could lead to further exploitation, such as arbitrary file read vulnerabilities.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Fuse 7 Jboss Bpms Jboss Enterprise Application Platform and 7 more

CVE-2026-24329

Wildfly-core: wildfly core: denial of service via malformed payload injection by an authenticated administrative user.

A flaw was found in wildfly-core. A remote user authenticated as an administrative user can inject a malformed payload into the Inet Address field through the Management Model. This injection causes the server to crash and become unrecoverable, as the payload is written into the standalone.xml configuration file. Manual intervention is required to restore server operation, leading to a denial of service.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Fuse 7 Jboss Bpms Jboss Enterprise Application Platform and 6 more

CVE-2026-19879

Io.undertow/undertow: undertow: http response header integrity issue due to character truncation

A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The `writeString()` method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific Unicode characters in user-controlled input that an application places into response headers. This can lead to the truncation of these characters into ASCII control characters or special symbols, potentially resulting in limited integrity impact or information disclosure if the application does not properly sanitize user input.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Of Apache Camel For Spring Boot Camel Spring Boot Enterprise Linux and 6 more

CVE-2026-14180

Undertow-core: undertow:http request smuggling via oversized chunk-size bit overlap

A flaw was found in the ChunkReader component of the Undertow HTTP server, which is used by WildFly and JBoss EAP to handle chunked transfer encoding. The issue occurs because the parser uses a single internal variable to store both the remaining chunk size and state flags. By sending a specially crafted request with an extremely large chunk size, an attacker can cause these values to overlap, tricking the parser into thinking a request has finished prematurely. This can allow a second, "smuggled" request to be processed out of sync, potentially bypassing security controls.

CVSS 3.1 · 5.3 Medium EPSS 1.0% KEV · Not listed

Vendors

Redhat

Products

Apache Camel Hawtio Build Of Apache Camel - Hawtio Build Of Apache Camel For Spring Boot and 11 more

CVE-2026-5680

Undertow-core: undertow: denial of service via websocket permessage-deflate processing

A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application.

CVSS 3.1 · 7.5 High EPSS 1.1% KEV · Not listed

Vendors

Redhat Undertow

Products

Apache Camel Hawtio Build Of Apache Camel - Hawtio Build Of Apache Camel For Spring Boot and 14 more

CVE-2026-15567

Wildfly: wildfly-iiop: wildfly-jacorb: wildfly: pre-auth denial of service on the iiop listener

A flaw was found in Wildfly. A remote unauthenticated attacker can trigger OutOfMemoryError as CSIv2Util's GSS token decoder reads an attacker-controlled length field without bounds checking and attempts to allocate a byte array of that size.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Fuse Jboss Enterprise Application Platform Jboss Enterprise Application Platform Els and 5 more

CVE-2026-15565

Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serverendpoint class with any @onmessage method

A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class that has any @OnMessage method. This allows an attacker to cause Denial of Service attack without authentication and using only a standard WebSocket handshake.

CVSS 3.1 · 7.5 High EPSS 1.0% KEV · Not listed

Vendors

Redhat

Products

Build Of Apache Camel For Spring Boot Camel Spring Boot Data Grid 8 and 10 more

CVE-2026-18209

Keycloak-services: keycloak-services: oidc redirect_uri fragment bypass in http parameter pollution check

A flaw was found in the keycloak-services component of Keycloak, which handles OpenID Connect (OIDC) authentication flows. The issue occurs because the security check designed to prevent HTTP parameter pollution only inspects the query portion of a redirect URL and ignores the fragment portion. When a client is configured with a wildcard redirect URI, an attacker can use this to inject duplicate security parameters into the login response. If a client application is not configured correctly, it might trust the attacker's injected data instead of the real security information from Keycloak, leading to session fixation or account confusion.

CVSS 3.1 · 3.4 Low EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-19729

Keycloak-services: keycloak-services: incomplete fix for arbitrary filesystem path probing via keystore parameters

A flaw was found in the key provider component of the keycloak-services library, which is the core engine for the Red Hat Build of Keycloak. The issue occurs because a previous fix for path probing was incomplete, allowing a realm administrator to still submit arbitrary filesystem paths as keystore parameters. This can be used to determine the existence and readability of files on the server, potentially exposing sensitive system information.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Red Hat Single Sign On and 1 more

CVE-2026-16089

Keycloak-services: keycloak-services: authorization codes can be retargeted to another client session

A flaw was found in the keycloak-services component of Red Hat Build of Keycloak. The issue occurs because OAuth 2.0 authorization codes are not properly bound to the client that originally requested them. An attacker who can intercept an authorization code can modify it to be redeemed by their own client, potentially allowing them to obtain access tokens for a victim's identity.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-16072

Keycloak-services: keycloak-services: organization invitation link exposure allows unauthorized member creation

A flaw was found in the organization management component of Keycloak. A delegated administrator with permission to manage organizations can create an invitation for a non-existent email address and then retrieve the secret registration link directly through the application programming interface. By using this link, the administrator can create new user accounts and add them to the organization without having the required user management permissions or access to the invited email account. This allows an administrator to bypass security boundaries and add unauthorized members to an organization.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-18218

Keycloak-services: keycloak-services: client not-before revocation ignored when realm not-before is older but nonzero

A flaw was found in the TokenManager component of the Keycloak identity management service. When an administrator attempts to revoke tokens for a specific application (client) using a "not-before" policy, the revocation may be silently ignored if the overall security realm already has an older, non-zero revocation policy in place. This issue can allow previously issued tokens to remain valid for refreshing sessions and accessing user information even after an administrator has attempted to invalidate them. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-18215

Keycloak-services: keycloak-services: microsoft external access-token exchange bypasses configured tenant

Keycloak provides a way to let users log in using Microsoft accounts while restricting access to a specific organization (tenant). A flaw was discovered where this restriction is ignored when using the token exchange feature. This means an attacker with a valid Microsoft token from a completely different organization could gain access to the Keycloak realm, potentially accessing sensitive data or performing unauthorized actions.

CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more