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Remote Code Execution in IBM WebSphere Application Server via Security Control Bypass

IdentifiersCVE-2026-9311CWE-94· Improper Control of Generation of…

CVE-2026-9311 is a remote code execution vulnerability affecting IBM WebSphere Application Server 9.0 and 8.5. According to the provided content, the flaw is caused by a bypass of security controls and can be leveraged remotely to conduct code injection attacks. The supplied CVE metadata classifies the issue as CWE-94 and gives a CVSS v3.1 vector of AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H, indicating network reachability, no required privileges, no user interaction, changed scope, and high impact across confidentiality, integrity, and availability. Specific vulnerable functions or code paths are not provided in the available content.

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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 can result in unauthenticated remote code execution against affected IBM WebSphere Application Server instances. Given the provided CVSS characteristics and supporting text, exploitation may allow an attacker to run arbitrary code in the target environment and thereby fully compromise the affected application server, including theft or exposure of sensitive data, modification of application or system state, deployment of malware or follow-on payloads, and disruption of service availability.

Mitigation

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

Where immediate patching is not possible, reduce exposure of affected WebSphere Application Server 9.0 and 8.5 instances by limiting network access to administrative and application interfaces, restricting reachability to trusted hosts and segments, and closely monitoring for suspicious requests or signs of code injection and post-exploitation activity. Because the issue is described as a security control bypass leading to remote code execution, organizations should urgently verify WebSphere security configurations and deploy IBM's interim fixes as soon as possible. The available content does not provide vendor-specific temporary workarounds beyond patching and configuration verification.

Remediation

Patch, then assume compromise.

IBM has released security bulletin patches and interim fixes for the disclosed WebSphere vulnerabilities. The provided content states that administrators should apply the IBM-issued fixes for affected traditional WebSphere Application Server versions 9.0 and 8.5 and references IBM support page https://www.ibm.com/support/pages/node/7274733 for vendor guidance. The content also notes that full collective upgrade packs are scheduled for later release. No more specific fix version information is provided in the available material.
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

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

8 SOURCESView more in app
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-2026-9311
NVD
nvd.nist.gov/vuln/detail/CVE-2026-9311
MITRE CWE · CWE-94
Improper Control of Generation of Code ('Code…
Vendor Advisory
ibm.com/support/pages/node/7274733
Remote Code Execution in IBM WebSphere Application Server via Security Control Bypass (CVE-2026-9311) | Mallory