CVE-2026-15328Network attack vector

Unauthenticated data access via request smuggling

Published Jul 28, 2026 · Updated Jul 28, 2026

HTTP request smuggling in IBM WebSphere 8.5 and 9.0 and Liberty 17.0.0.3 through 26.0.0.8 allows remote attackers to read or alter data. IBM has not disclosed which HTTP framing input or parser operation causes front-end and back-end components to disagree on request boundaries. The issue is remotely reachable without authentication only when a listed servlet feature is enabled; IBM reports no service-interruption impact.

CVSS severity7.4
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP request smuggling in IBM WebSphere 8.5 and 9.0 and Liberty 17.0.0.3 through 26.0.0.8 allows remote attackers to read or alter data. IBM has not disclosed which HTTP framing input or parser operation causes front-end and back-end components to disagree on request boundaries. The issue is remotely reachable without authentication only when a listed servlet feature is enabled; IBM reports no service-interruption impact.

The record

CVE
CVE-2026-15328
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
OpenBMC Project
Product
IBM WebSphere Application Server Liberty
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17.0.0.3 <=26.0.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenBMC Project · IBM WebSphere Application Server Libertyversion=17.0.0.3 <=26.0.0.7
OpenBMC Project · IBM WebSphere Application Serverversion=8.5; version=9.0

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.4IBMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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