CVE-2026-73703

Arbitrary browser script execution via stored XSS

Published Sep 1, 2026 · Updated Sep 2, 2026

Stored XSS in HPE Aruba Networking Fabric Composer 7.0.0 through 7.3.3 allows remote attackers to execute arbitrary scripts in a user's browser. HPE has not published the input field, request handler, or missing output-encoding operation that stores and renders the untrusted content. Exploitation requires adjacent network access without authentication and a user to view the stored content; code runs in the affected interface's browser context.

CVSS severity8.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in HPE Aruba Networking Fabric Composer 7.0.0 through 7.3.3 allows remote attackers to execute arbitrary scripts in a user's browser. HPE has not published the input field, request handler, or missing output-encoding operation that stores and renders the untrusted content. Exploitation requires adjacent network access without authentication and a user to view the stored content; code runs in the affected interface's browser context.

The record

CVE
CVE-2026-73703
Published
Sep 1, 2026
Updated
Sep 2, 2026
Vendor
Hewlett Packard Enterprise (HPE)
Product
HPE Aruba Networking Fabric Composer
Classifications
CWE-79, T1059.007
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 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=7.0.0 <=7.3.3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Hewlett Packard Enterprise (HPE) · HPE Aruba Networking Fabric Composerversion=7.0.0 <=7.3.3

Published CVSS scores

8.8Hewlett Packard EnterpriseCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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