CVE-2026-101158

High

Description

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.

SeverityHigh

CVSS8.4

Exploit probability—

ProductCloudVision Portal

PublishedOct 6, 2026

First seenOct 6, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

Arista Networks CloudVision Portal2025.3.0 or later

Vendor advisories

arista.com/en/support/advisories-notices/security-advisory/24801-security-advisory-0185

Affected products

Product	Affected versions	Fixed in
Arista Networks CloudVision Portal	2026.2.0, 2026.1.0 ≤ v ≤ 2026.1.2, 2025.3.0 ≤ v ≤ 2025.3.3, 1.0.0 ≤ v < 2025.3.0	2025.3.0

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