What is CVE-2026-101158?

CVE-2026-101158 is a high-severity vulnerability in Arista Networks Cloudvision Portal, classified under Cross-site Scripting. CVSS score: 8.4/10. Published 2026-10-06.

How severe is CVE-2026-101158?

High severity. CVSS v3 base score is 8.4 out of 10.

XSS in Arista Networks Cloudvision Portal

CVE-2026-101158

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-06 · last modified 2026-10-07.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Arista Networks Cloudvision Portal — versions 2026.2.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.arista.com/en/support/advisories-notices/security-advisory/24801-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-101158?: CVE-2026-101158 is a high-severity vulnerability in Arista Networks Cloudvision Portal, classified under Cross-site Scripting. CVSS score: 8.4/10. Published 2026-10-06.
How severe is CVE-2026-101158?: High severity. CVSS v3 base score is 8.4 out of 10.