Critical

Identity Spoofing in IBM WebSphere Application Server

IdentifiersCVE-2026-8644CWE-290· Authentication Bypass by Spoofing

CVE-2026-8644 is an identity spoofing vulnerability affecting IBM WebSphere Application Server traditional versions 9.0 and 8.5. IBM classifies the issue as CWE-290 (Authentication Bypass by Spoofing). The available information indicates a configuration-related flaw that allows an untrusted remote actor to successfully forge user identities and bypass authentication controls without valid credentials. The issue is remotely exploitable over the network with low attack complexity, requires no privileges, and does not require user interaction. IBM lists affected platforms including AIX, IBM i, Linux, Windows, and z/OS.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows a remote unauthenticated attacker to impersonate legitimate users and bypass enterprise security boundaries. Based on the published CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H), the primary impacts are high integrity and high availability impact, with no stated confidentiality impact in the CVSS record. Supporting content also indicates that exploitation could enable unauthorized access to internal application functionality and manipulation of internal corporate records, and may facilitate further unauthorized actions within the affected WebSphere environment.

Mitigation

If you can’t patch tonight, do this now.

IBM stated that no workarounds or mitigations are available for CVE-2026-8644. The recommended action is immediate remediation by applying the IBM-provided interim fix for APAR PH71422 or upgrading to the fixed releases when available.

Remediation

Patch, then assume compromise.

IBM states that the fix for this vulnerability is contained in APAR PH71422. For WebSphere Application Server traditional 9.0.0.0 through 9.0.5.28, customers should upgrade to the minimum supported fix pack level and apply the interim fix for PH71422, then move to Fix Pack 9.0.5.29 or later when available. For WebSphere Application Server traditional 8.5.0.0 through 8.5.5.29, customers should upgrade to the minimum supported fix pack level and apply the interim fix for PH71422, then move to Fix Pack 8.5.5.30 or later when available. IBM also notes that additional interim fixes may be available from its interim fix download page.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

International Business MachinesWebsphere Application Serverapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

9 SOURCESView more in app

security online infoNews

Jun 5, 2026

IBM WebSphere Execution Flaws: Critical Patches Issued

A critical IBM WebSphere authentication bypass and identity spoofing vulnerability that allows remote attackers to forge identities and bypass authentication.

cvefeed high severityNews

Jun 1, 2026

CVE-2026-8644 - IBM WebSphere Application Server is affected by an identity spoofing vulnerability

An identity spoofing vulnerability affecting IBM WebSphere Application Server 9.0 and 8.5.

ibm supportNews

Jun 1, 2026

Security Bulletin: IBM WebSphere Application Server is affected by an identity spoofing vulnerability (CVE-2026-8644)

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.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity6

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-8644

NVD

nvd.nist.gov/vuln/detail/CVE-2026-8644

MITRE CWE · CWE-290

Authentication Bypass by Spoofing

Vendor Advisory

ibm.com/support/pages/node/7274740