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CVE-2026-8644 is an authentication-bypass-by-spoofing vulnerability in IBM WebSphere Application Server traditional 8.5 and 9.0. Improper signature validation in the authentication mechanism can cause forged or tampered identity assertions to be accepted as legitimate, enabling an unauthenticated remote actor to impersonate users. Affected releases are WebSphere Application Server traditional 9.0.0.0 through 9.0.5.28 and 8.5.0.0 through 8.5.5.29 on AIX, IBM i, Linux, Windows, and z/OS.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
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.
21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical IBM WebSphere authentication bypass and identity spoofing vulnerability that allows remote attackers to forge identities and bypass authentication.
An identity spoofing vulnerability affecting IBM WebSphere Application Server 9.0 and 8.5.
An identity spoofing vulnerability in IBM WebSphere Application Server that can enable authentication bypass by spoofing. It is significant due to its high CVSS 9.1 severity and impact on integrity and availability.
A critical identity spoofing/authentication bypass vulnerability in IBM WebSphere Application Server traditional caused by improper signature validation.
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.