# CVE-2026-73781 — Hewlett Packard Enterprise (HPE) AOS-CX

> As of 2026-09-03, CVE-2026-73781 is a HIGH-severity vulnerability in Hewlett Packard Enterprise (HPE) AOS-CX, CVSS v3.1 8.4, EPSS 0.5% (41.9th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-73781, most recently “HPE Patches Critical ArubaOS-CX Buffer Overflow (CVE-2026-73749) Enabling Unauthenticated Remote Code Execution”.

**Last updated:** 2026-09-03

## What is CVE-2026-73781?

A vulnerability in the web-based management interface of AOS-CX could allow an authenticated remote attacker to conduct a stored cross-site scripting (XSS) attack against an administrative user of the interface. A successful exploit allows an attacker to execute arbitrary script code in a victim's browser in the context of the affected interface.

The record classifies CVE-2026-73781 under weakness class [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs high-privilege credentials, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 54 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.4 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.5% probability of exploitation in the next 30 days, higher than 41.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-01, last modified 2026-09-03

## Is CVE-2026-73781 being exploited?

It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Hewlett Packard Enterprise (HPE)](https://intel.threadlinqs.com/vendors/hewlett-packard-enterprise-hpe): AOS-CX

## How to fix CVE-2026-73781

The record marks a vendor fix as available for CVE-2026-73781. Patch reference: [https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05134en_us&docLocale=en_US](https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05134en_us&docLocale=en_US). Vendor advisory: [https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05134en_us&docLocale=en_US](https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05134en_us&docLocale=en_US). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2026-73781

1 tracked threat in the Threadlinqs corpus references CVE-2026-73781, either in the campaign’s CVE list or as an indicator on the campaign record.

- [HPE Patches Critical ArubaOS-CX Buffer Overflow (CVE-2026-73749) Enabling Unauthenticated Remote Code Execution](https://intel.threadlinqs.com/threat/TL-2026-2314) — CRITICAL · 2026-09-03

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [support.hpe.com](https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05134en_us&docLocale=en_US)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-73781
Full detection coverage and IOCs for threats exploiting CVE-2026-73781 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp