CVE-2026-16186Network attack vectorHinoki check available

Browser script execution via reflected input

Published Sep 14, 2026 · Updated Sep 14, 2026

Reflected XSS in IBM WebSphere Application Server 8.5 and 9.0 allows remote attackers to execute script through crafted web input. IBM has not published the affected endpoint, parameter, or encoding failure that reflects untrusted input into an HTML response. Exploitation requires a user to open attacker-controlled content, allowing script execution in that user's browser context.

CVSS severity5.4
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Reflected XSS in IBM WebSphere Application Server 8.5 and 9.0 allows remote attackers to execute script through crafted web input. IBM has not published the affected endpoint, parameter, or encoding failure that reflects untrusted input into an HTML response. Exploitation requires a user to open attacker-controlled content, allowing script execution in that user's browser context.

The record

CVE
CVE-2026-16186
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
IBM
Product
IBM WebSphere Application Server
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 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=8.5
  2. Affected versionversion=9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM WebSphere Application Serverversion=8.5; version=9.0

Published CVSS scores

5.4IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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