Websphere Extreme Scale

Remote code execution in IBM WebSphere eXtreme Scale 8.6.1.0-8.6.1.6 arises because three bundled ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) deserialize untrusted data without any JEP-290 lookahead class filter. When Oracle Coherence is present on the classpath, confirmed working gadget chains (RemoteConstructor.readResolve, PriorityQueue/ExtractorComparator) let a low-privileged authenticated attacker who can write a session attribute - or a LAN-adjacent attacker on the unauthenticated grid replication wire - run arbitrary code on peer WebSphere Application Server JVMs. A vendor patch is available; there is no public exploit identified and EPSS is low (0.29%), but IBM confirms the gadget chains function, giving total technical impact per SSVC.

Arbitrary constructor invocation (leading to code execution) in IBM WebSphere eXtreme Scale 8.6.1.0 through 8.6.1.6 lets an authenticated remote attacker who can influence an application-built Object Query Language (OQL) query force the engine to resolve attacker-named classes via Class.forName() and instantiate them without any allow-list. Three distinct sinks are affected (SELECT NEW, enum literals, and reflection-based comparators), and a SELECT DISTINCT variant using planted grid values triggers the gadget post-readObject in a way that bypasses JEP-290 serialization filters across grid nodes. There is no public exploit identified at time of analysis and EPSS is low (0.27%), but the CVSS 9.9 scope-changing impact makes this a high-priority patch for exposed grid deployments.

Remote code execution in IBM WebSphere eXtreme Scale 8.6.1.0 through 8.6.1.6 arises from roughly 50 generated CORBA stub classes in the shipped ogclient.jar that invoke ORB.string_to_object() on an attacker-controlled IOR string during Java deserialization, converting any unfiltered ObjectInputStream sink in the surrounding WebSphere Application Server into outbound IIOP server-side request forgery. When chained with the IBM ORB getUserException class-instantiation flaw (tracked as WAS-26), that SSRF escalates to code execution on the calling JVM. CVSS is 10.0 (scope-changed, full CIA impact); EPSS is 3.01% (86th percentile) and there is no public exploit identified at time of analysis.

Denial of service in IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 allows adjacent unauthenticated attackers to crash the WebSphere Application Server JVM by sending malformed XDF-encoded Protocol Buffers messages to the data grid. The XDF decoder fails to enforce bounds on recursive protobuf message nesting depth and attacker-supplied length prefixes, triggering either a StackOverflowError or OutOfMemoryError that takes down the JVM process. No public exploit has been identified at time of analysis, and IBM has released a patch via their support advisory.

IBM WebSphere eXtreme Scale 8.6 Admin API is vulnerable to cross-site scripting. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

IBM WebSphere eXtreme Scale 8.6 Admin Console allows web pages to be stored locally which can be read by another user on the system. Rated low severity (CVSS 3.3), this vulnerability is low attack complexity. No vendor patch available.

IBM WebSphere eXtreme Scale 8.6 Admin Console could allow a remote attacker to hijack the clicking action of the victim. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

IBM WebSphere eXtreme Scale 8.6 Admin Console is vulnerable to cross-site scripting. Rated medium severity (CVSS 4.8), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

IBM WebSphere eXtreme Scale and the WebSphere DataPower XC10 Appliance allow some sensitive data to linger in memory instead of being overwritten which could allow a local user with administrator. Rated medium severity (CVSS 4.4), this vulnerability is low attack complexity. This Exposure of Sensitive Information vulnerability could allow attackers to access sensitive data that should not be disclosed.

IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3, 7.1.1 before 7.1.1.1, 8.5 before 8.5.0.3, and 8.6 before 8.6.0.8 does not properly encrypt data, which makes it easier for remote attackers to obtain. Rated low severity (CVSS 3.7), this vulnerability is remotely exploitable, no authentication required. This Exposure of Sensitive Information vulnerability could allow attackers to access sensitive data that should not be disclosed.

CRLF injection vulnerability in IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3, 7.1.1 before 7.1.1.1, 8.5 before 8.5.0.3, and 8.6 before 8.6.0.8 allows remote attackers to inject arbitrary HTTP. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Cross-site scripting (XSS) vulnerability in IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3 and 7.1.1 before 7.1.1.1 allows remote authenticated users to inject arbitrary web script or HTML via a. Rated low severity (CVSS 3.5), this vulnerability is remotely exploitable.

IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3 and 7.1.1 before 7.1.1.1 has an improper account-lockout setting, which makes it easier for remote attackers to obtain access via a brute-force attack. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity.

Session fixation vulnerability in IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3 and 7.1.1 before 7.1.1.1 allows remote attackers to hijack web sessions via a session identifier. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable.

CRLF injection vulnerability in IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3 and 7.1.1 before 7.1.1.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable.

IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3 and 7.1.1 before 7.1.1.1 improperly performs logout actions, which allows remote attackers to bypass intended access restrictions by leveraging an. Rated low severity (CVSS 2.1), this vulnerability is low attack complexity.

Cross-site request forgery (CSRF) vulnerability in IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3 and 7.1.1 before 7.1.1.1 allows remote authenticated users to hijack the authentication of. Rated medium severity (CVSS 6.0), this vulnerability is remotely exploitable.

IBM WebSphere eXtreme Scale 7.1.0 before 7.1.0.3 and 7.1.1 before 7.1.1.1 does not set the secure flag for the session cookie in an https session, which makes it easier for remote attackers to. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. This Exposure of Sensitive Information vulnerability could allow attackers to access sensitive data that should not be disclosed.

Unspecified vulnerability in IBM WebSphere eXtreme Scale 8.6 through 8.6.0.8 allows remote attackers to cause a denial of service via unknown vectors. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity.

The monitoring console in IBM WebSphere eXtreme Scale 7.1.0, 7.1.1, 8.5.0, and 8.6.0 allows remote authenticated users to conduct phishing attacks via unspecified vectors. Rated medium severity (CVSS 4.9), this vulnerability is remotely exploitable. No vendor patch available.

The monitoring console in IBM WebSphere eXtreme Scale 7.1.0, 7.1.1, 8.5.0, and 8.6.0 does not properly process logoff actions, which has unspecified impact and remote attack vectors. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Cross-site scripting (XSS) vulnerability in the monitoring console in IBM WebSphere eXtreme Scale 7.1.0, 7.1.1, 8.5.0, and 8.6.0 allows remote authenticated users to inject arbitrary web script or. Rated low severity (CVSS 3.5), this vulnerability is remotely exploitable. No vendor patch available.