Redhat Single Sign-On vulnerabilities

CVE-2023-44487 [HIGH] CWE-400 CVE-2023-44487: The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancell The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

CVE-2023-48795 [MEDIUM] CWE-354 CVE-2023-48795: The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other pr The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgr

CVE-2021-4104 [HIGH] CWE-502 CVE-2021-4104: JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has wr JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. The attacker can provide TopicBindingName and TopicConnectionFactoryBindingName configurations causing JMSAppender to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-44228.

CVE-2024-8883 [MEDIUM] CWE-601 CVE-2024-8883: A misconfiguration flaw was found in Keycloak. This issue can allow an attacker to redirect users to A misconfiguration flaw was found in Keycloak. This issue can allow an attacker to redirect users to an arbitrary URL if a 'Valid Redirect URI' is set to http://localhost or http://127.0.0.1, enabling sensitive information such as authorization codes to be exposed to the attacker, potentially leading to session hijacking.

CVE-2020-27838 [MEDIUM] CWE-287 CVE-2020-27838: A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fe A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.

CVE-2019-9515 [HIGH] CWE-400 CVE-2019-9515: Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of s Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. The attacker sends a stream of SETTINGS frames to the peer. Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalent in behavior to a ping. Depending on how efficiently th

CVE-2019-9514 [HIGH] CWE-400 CVE-2019-9514: Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a denial of serv Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a denial of service. The attacker opens a number of streams and sends an invalid request over each stream that should solicit a stream of RST_STREAM frames from the peer. Depending on how the peer queues the RST_STREAM frames, this can consume excess memory, CPU, or both

CVE-2019-14379 [CRITICAL] CWE-1321 CVE-2019-14379: SubTypeValidator.java in FasterXML jackson-databind before 2.9.9.2 mishandles default typing when eh SubTypeValidator.java in FasterXML jackson-databind before 2.9.9.2 mishandles default typing when ehcache is used (because of net.sf.ehcache.transaction.manager.DefaultTransactionManagerLookup), leading to remote code execution.

CVE-2026-28367 [CRITICAL] CWE-444 CVE-2026-28367: A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` a A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipul

CVE-2026-28368 [CRITICAL] CWE-444 CVE-2026-28368: A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially cra A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks, potentially bypassing security controls and accessing u

CVE-2026-28369 [CRITICAL] CWE-444 CVE-2026-28369: A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line sta A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attack

CVE-2025-12543 [CRITICAL] CWE-20 CVE-2025-12543: A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Ja A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications. The Undertow library fails to properly validate the Host header in incoming HTTP requests.As a result, requests containing malformed or malicious Host headers are processed without rejection, enabling attackers to poison caches, perf

CVE-2020-1714 [HIGH] CWE-20 CVE-2020-1714: A flaw was found in Keycloak before version 11.0.0, where the code base contains usages of ObjectInp A flaw was found in Keycloak before version 11.0.0, where the code base contains usages of ObjectInputStream without type checks. This flaw allows an attacker to inject arbitrarily serialized Java Objects, which would then get deserialized in a privileged context and potentially lead to remote code execution.

CVE-2022-4039 [CRITICAL] CWE-276 CVE-2022-4039: A flaw was found in Red Hat Single Sign-On for OpenShift container images, which are configured with A flaw was found in Red Hat Single Sign-On for OpenShift container images, which are configured with an unsecured management interface enabled. This flaw allows an attacker to use this interface to deploy malicious code and access and modify potentially sensitive information in the app server configuration.

CVE-2018-12023 [HIGH] CWE-502 CVE-2018-12023: An issue was discovered in FasterXML jackson-databind prior to 2.7.9.4, 2.8.11.2, and 2.9.6. When De An issue was discovered in FasterXML jackson-databind prior to 2.7.9.4, 2.8.11.2, and 2.9.6. When Default Typing is enabled (either globally or for a specific property), the service has the Oracle JDBC jar in the classpath, and an attacker can provide an LDAP service to access, it is possible to make the service execute a malicious payload.

CVE-2026-3009 [HIGH] CWE-863 CVE-2026-3009: A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication to proceed using an Identity Provider (IdP) even after it has been disabled by an administrator. An attacker who knows the IdP alias can reuse a previously generated login request to bypass the administrative restriction. This undermines access control e

CVE-2018-12022 [HIGH] CWE-502 CVE-2018-12022: An issue was discovered in FasterXML jackson-databind prior to 2.7.9.4, 2.8.11.2, and 2.9.6. When De An issue was discovered in FasterXML jackson-databind prior to 2.7.9.4, 2.8.11.2, and 2.9.6. When Default Typing is enabled (either globally or for a specific property), the service has the Jodd-db jar (for database access for the Jodd framework) in the classpath, and an attacker can provide an LDAP service to access, it is possible to make the servic

CVE-2019-10212 [CRITICAL] CWE-532 CVE-2019-10212: A flaw was found in, all under 2.0.20, in the Undertow DEBUG log for io.undertow.request.security. I A flaw was found in, all under 2.0.20, in the Undertow DEBUG log for io.undertow.request.security. If enabled, an attacker could abuse this flaw to obtain the user's credentials from the log files.

CVE-2019-14843 [HIGH] CWE-592 CVE-2019-14843: A flaw was found in Wildfly Security Manager, running under JDK 11 or 8, that authorized requests fo A flaw was found in Wildfly Security Manager, running under JDK 11 or 8, that authorized requests for any requester. This flaw could be used by a malicious app deployed on the app server to access unauthorized information and possibly conduct further attacks. Versions shipped with Red Hat Jboss EAP 7 and Red Hat SSO 7 are vulnerable to this issue.

CVE-2023-2585 [HIGH] CWE-358 CVE-2023-2585: Keycloak's device authorization grant does not correctly validate the device code and client ID. An Keycloak's device authorization grant does not correctly validate the device code and client ID. An attacker client could abuse the missing validation to spoof a client consent request and trick an authorization admin into granting consent to a malicious OAuth client or possible unauthorized access to an existing OAuth client.