Seven IBM WebSphere Liberty Flaws Can Lead to Takeover
🔒 Researchers warn that seven vulnerabilities in IBM WebSphere Liberty can be chained from a pre-authentication SAML Web SSO flaw into full server compromise. The initial defect, tracked as CVE-2026-1561, allows unauthenticated attackers to supply crafted serialized payloads because a String.concat() misuse makes the integrity check ineffective, enabling pre-auth RCE against exposed SAML endpoints. Subsequent AdminCenter weaknesses let low-privileged 'reader' users retrieve keys and sensitive configuration, forge tokens, and abuse an archive-extraction flaw to write arbitrary files; IBM has issued patches and configuration guidance to mitigate the chain.
