---
id: CVE-2026-101158
title: >-
  A missing input validation vulnerability in the Fileserver upload API allows
  an authenticated attacker with file upload privileges to execute stored
  cross-site scripting (XSS)
summary: >-
  A missing input validation vulnerability in the Fileserver upload API allows
  an authenticated attacker with file upload privileges to execute stored
  cross-site scripting (XSS). Successful exploitation could enable the attacker
  to hijack …
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-79
vendor: Arista Networks
product: CloudVision Portal
affected:
  - cloudvision_portal 2026.2.0
  - cloudvision_portal >= 2026.1.0 <= 2026.1.2
  - cloudvision_portal >= 2025.3.0 <= 2025.3.3
  - cloudvision_portal >= 1.0.0 < 2025.3.0
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T20:17:10.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101158'
references:
  - url: >-
      https://www.arista.com/en/support/advisories-notices/security-advisory/24801-security-advisory-0185
    label: psirt@arista.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-06T19:51:37.462404Z'
ingestedAt: '2026-10-06T20:16:42.476Z'
---

## Overview

A missing input validation vulnerability in the Fileserver upload API allows an authenticated attacker with file upload privileges to execute stored cross-site scripting (XSS). Successful exploitation could enable the attacker to hijack another CloudVision user's web session, potentially granting full access to their account and administrative permissions.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.