Redhat Single Sign-On vulnerabilities

CVE-2026-28368 [HIGH] 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 unaut

CVE-2026-28369 [HIGH] 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 attacker t

CVE-2026-3121 [MEDIUM] CWE-266 CVE-2026-3121: A flaw was found in Keycloak. An administrator with `manage-clients` permission can exploit a miscon A flaw was found in Keycloak. An administrator with `manage-clients` permission can exploit a misconfiguration where this permission is equivalent to `manage-permissions`. This allows the administrator to escalate privileges and gain control over roles, users, or other administrative functions within the realm. This privilege escalation can occur when

CVE-2026-4874 [LOW] CWE-918 CVE-2026-4874: A flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSR A flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the `client_session_host` parameter during refresh token requests. This occurs when a Keycloak client is configured to use the `backchannel.logout.url` with the `application.session.host` placeholder. Successful exploitation allows the a

CVE-2026-3260 [MEDIUM] CWE-770 CVE-2026-3260: A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending an HTTP A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending an HTTP GET request containing multipart/form-data content. If the underlying application processes parameters using methods like `getParameterMap()`, the server prematurely parses and stores this content to disk. This could lead to resource exhaustion, potentia

CVE-2026-4366 [MEDIUM] CWE-918 CVE-2026-4366: A flaw was identified in Keycloak, an identity and access management solution, where it improperly f A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud

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-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-2025-9784 [HIGH] CWE-770 CVE-2025-9784: A flaw was found in Undertow where malformed client requests can trigger server-side stream resets w A flaw was found in Undertow where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the "MadeYouReset" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implem

CVE-2023-1932 [MEDIUM] CWE-79 CVE-2023-1932: A flaw was found in hibernate-validator's 'isValid' method in the org.hibernate.validator.internal.c A flaw was found in hibernate-validator's 'isValid' method in the org.hibernate.validator.internal.constraintvalidators.hv.SafeHtmlValidator class, which can be bypassed by omitting the tag ending in a less-than character. Browsers may render an invalid html, allowing HTML injection or Cross-Site-Scripting (XSS) attacks.

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-2023-6841 [HIGH] CWE-231 CVE-2023-6841: A denial of service vulnerability was found in keycloak where the amount of attributes per object is A denial of service vulnerability was found in keycloak where the amount of attributes per object is not limited,an attacker by sending repeated HTTP requests could cause a resource exhaustion when the application send back rows with long attribute values.

CVE-2024-7341 [HIGH] CWE-384 CVE-2024-7341: A session fixation issue was discovered in the SAML adapters provided by Keycloak. The session ID an A session fixation issue was discovered in the SAML adapters provided by Keycloak. The session ID and JSESSIONID cookie are not changed at login time, even when the turnOffChangeSessionIdOnLogin option is configured. This flaw allows an attacker who hijacks the current session before authentication to trigger session fixation.

CVE-2024-4629 [MEDIUM] CWE-837 CVE-2024-4629: A vulnerability was found in Keycloak. This flaw allows attackers to bypass brute force protection b A vulnerability was found in Keycloak. This flaw allows attackers to bypass brute force protection by exploiting the timing of login attempts. By initiating multiple login requests simultaneously, attackers can exceed the configured limits for failed attempts before the system locks them out. This timing loophole enables attackers to make more guesses

CVE-2024-7885 [HIGH] CWE-362 CVE-2024-7885: A vulnerability was found in Undertow where the ProxyProtocolReadListener reuses the same StringBuil A vulnerability was found in Undertow where the ProxyProtocolReadListener reuses the same StringBuilder instance across multiple requests. This issue occurs when the parseProxyProtocolV1 method processes multiple requests on the same HTTP connection. As a result, different requests may share the same StringBuilder instance, potentially leading to inform

CVE-2024-1132 [HIGH] CWE-22 CVE-2024-1132: A flaw was found in Keycloak, where it does not properly validate URLs included in a redirect. This A flaw was found in Keycloak, where it does not properly validate URLs included in a redirect. This issue could allow an attacker to construct a malicious request to bypass validation and access other URLs and sensitive information within the domain or conduct further attacks. This flaw affects any client that utilizes a wildcard in the Valid Redirect URI

CVE-2024-1635 [HIGH] CWE-400 CVE-2024-1635: A vulnerability was found in Undertow. This vulnerability impacts a server that supports the wildfly A vulnerability was found in Undertow. This vulnerability impacts a server that supports the wildfly-http-client protocol. Whenever a malicious user opens and closes a connection with the HTTP port of the server and then closes the connection immediately, the server will end with both memory and open file limits exhausted at some point, depending on the

CVE-2023-6291 [HIGH] CWE-601 CVE-2023-6291: A flaw was found in the redirect_uri validation logic in Keycloak. This issue may allow a bypass of A flaw was found in the redirect_uri validation logic in Keycloak. This issue may allow a bypass of otherwise explicitly allowed hosts. A successful attack may lead to an access token being stolen, making it possible for the attacker to impersonate other users.

CVE-2023-2585 [LOW] 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.

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