Vulnerability · Published Oct 6, 2026 · Assigned by Arista

CVE-2026-101158Security Advisory 0185

High 8.4

In plain English

A high-severity cross-site scripting in CloudVision Portal from Arista Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS 3.1)8.4High

Exploit odds (30 days)0.3%top 79.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Arista Networks	CloudVision Portal	2026.2.02026.1.0 – through 2026.1.22025.3.0 – through 2025.3.31.0.0 – before 2025.3.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24801-security-advisory-0185 vendor-advisory