Medium5.4Cisco

Medium [CVE-2026-20108] Cisco Catalyst SD-WAN Manager Cross-Site Scripting Vulnerability

This medium-severity Cisco advisory covers CVE-2026-20108 affecting Cisco Catalyst SD-WAN Manager.

cisco-sa-vmanage-xss-ZqkhP9W9 Published Mar 25, 2026Updated by vendor Mar 25, 2026

CVE-2026-20108

Affected products & platforms

CiscoSD-WANCatalyst SD-WAN

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Summary

A vulnerability in the web-based management interface of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface of an affected device. This vulnerability is due to insufficient validation of user input.

An attacker could exploit this vulnerability by persuading a user of the web-based management interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based informatio…

Affected versions

Scope: At the time of publication, this vulnerability affected Cisco Catalyst SD-WAN Manager, regardless of device configuration.
Release 20.12 (first fixed: 20.12.5.3)
Release 20.12.6.1 (first fixed: 20.131)
Release Migrate to a fixed release (first fixed: 20.141)
Release Migrate to a fixed release (first fixed: 20.15)
Release 20.15.4.2 (first fixed: 20.15.5)
20.161 — Migrate to a fixed release
Release 20.18 (first fixed: 20.18.2.1)

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

20.12.5.3
20.131
20.141
20.15
20.15.5
20.18.2.1

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
Release 20.12: upgrade to 20.12.5.3.
Release 20.12.6.1: upgrade to 20.131.
Release Migrate to a fixed release: upgrade to 20.141.
Release Migrate to a fixed release: upgrade to 20.15.
Release 20.15.4.2: upgrade to 20.15.5.
Release 20.161: migrate to a fixed release.
Release 20.18: upgrade to 20.18.2.1.

Workaround status

There are no workarounds that address this vulnerability.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Cisco Security Advisories (PSIRT)official
Official vendor feed — the source of truth for this advisory. VulniPulse polled this feed and parsed this entry from it. Discovered from the machine-readable feed https://sec.cloudapps.cisco.com/security/center/psirtrss20/CiscoSecurityAdvisory.xml; this link opens the Cisco advisory index instead of the raw feed document.
Cisco
Vendor advisory pageofficial
Advisory page fetched and parsed to extract affected/fixed versions and mitigation guidance beyond what the feed carries.
Cisco

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-20108NVD CVE.org MITRE

Official resources

Cisco Catalyst SD-WAN release notes & compatibility matrix
Release notes
Release notes for the fixed Catalyst SD-WAN (vManage/vBond/vSmart) and IOS XE SD-WAN builds — includes the controller/edge device compatibility matrix.
Cisco Catalyst SD-WAN controller upgrade guide (target: 20.12.5.3 / 20.131 / 20.141)
Official documentation
This advisory names 20.12.5.3 / 20.131 / 20.141 as the first fixed releases — official upgrade documentation for Catalyst SD-WAN controllers (vManage, vBond, vSmart) and IOS XE SD-WAN edge devices.
Cisco Software Checker
Official documentation
Official tool to confirm whether your exact IOS / IOS XE / NX-OS / ASA / FTD / SD-WAN release is affected and to find the first fixed release.

Discussion(0)

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