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CVE-2026-9330 is an unsafe deserialization vulnerability in the SAML Web Single Sign-On component of IBM WebSphere Application Server traditional 8.5 and 9.0. The component deserializes user-controlled Java object data supplied through the SAML SSO flow. Its intended integrity protection can be bypassed because the digest construction mishandles immutable Java strings, permitting an attacker to forge a serialized client-side request value. A suitable Java gadget chain available on the target classpath can then be triggered during deserialization to execute code.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability in IBM WebSphere Application Server caused by improper validation of user-supplied data during deserialization in the SAML Web Single Sign-On component.
A critical IBM WebSphere deserialization vulnerability in the SAML processing component that may enable remote code execution.
A deserialization of untrusted data vulnerability in IBM WebSphere Application Server traditional SAML Web Single Sign-On that can allow a low-privilege authenticated attacker to achieve remote code execution via a crafted cookie and suitable gadget chain.
Another remote code execution vulnerability in IBM WebSphere Application Server co-disclosed with CVE-2026-9311 and remediated by the same fix packs.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.