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Cisco Catalyst SD-WAN Manager actively exploited file upload overwrite flaw (CVE-2026-20262)

Vulnerability
First reported
Last updated
Happening score
H score 24
2 unique sources, 2 articles

Summary

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Cisco Catalyst SD-WAN Manager was patched for CVE-2026-20262 after attackers used it to create or overwrite files and escalate to root across all deployment types. The flaw affected on-prem, Cloud-Pro, Cloud (Managed), and Government deployments. Cisco tied the issue to the web UI and an affected API endpoint that accepted crafted HTTP requests. Cisco also shared IOCs for index.jsp and .war upload attempts so administrators can hunt for compromise.

Related Happenings

Cisco Catalyst SD-WAN unauthorized peering and SSH access campaign

Campaign
H score38 First: 25.06.2026 17:15 Last: 25.06.2026 17:15 Sources 1

About this happening: An active campaign used unauthorized peering connections and SSH access to maintain footholds inside a service provider's Cisco Catalyst SD-WAN environment, increa...

Open Happening

CISA adds CVE-2026-20262 to KEV and orders federal fixes

Public Sector Action
H score32 First: 16.06.2026 09:05 Last: 16.06.2026 09:05 Sources 1

How related: The development has prompted the U.S. Cybersecurity and Infrastructure Security Agency (CISA) to add the flaw to its Known Exploited Vulnerabilities (KEV) catalog, requiring Federal Civilian Executive Branch (FCEB) agencies to apply the fixes by June 29, 2026.

About this happening: CISA added CVE-2026-20262 to its Known Exploited Vulnerabilities (KEV) catalog and required Federal Civilian Executive Branch (FCEB) agencies to apply Cisco's fixe...

Open Happening

Cisco Catalyst SD-WAN Manager root privilege escalation flaw (CVE-2026-20245)

Vulnerability
H score60 First: 05.06.2026 09:24 Last: 05.06.2026 09:24 Sources 1

About this happening: CVE-2026-20245 in Cisco Catalyst SD-WAN Manager is an actively exploited high-severity vulnerability that can let an authenticated local attacker with netadm...

Latest development: 06.06.2026 07:19

Cisco warned that CVE-2026-20245 in Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, is under active exploitation and can let an authenticated local attacker with netadmin privileges upload a crafted file to execute arbitrary commands as root. Cisco said the flaw affects On-Prem Deployment, Cisco SD-WAN Cloud-Pro, Cisco SD-WAN Cloud (Cisco Managed), and Cisco SD-WAN for Government (FedRAMP), that limited exploitation has already resulted in configuration changes pushed to edge devices, and that no patches or mitigations are currently available. Cisco also advised checking /var/log/scripts.log for indicators of compromise and credited Google Mandiant researchers Chester Sng, Pete Boonyakarn, and Logeswaran Nadarajan with discovering and reporting the issue.

Open Happening

Cisco Secure Workload REST API validation/authentication flaw (CVE-2026-20223)

Vulnerability
H score49 First: 21.05.2026 15:04 Last: 21.05.2026 15:04 Sources 1

About this happening: Cisco Secure Workload Cluster Software was patched for CVE-2026-20223, a critical REST API flaw that could let attackers gain Site Admin privileges and cross tenan...

Open Happening

Cisco Catalyst SD-WAN authentication bypass flaw actively exploited (CVE-2026-20182)

Vulnerability
H score60 First: 14.05.2026 23:09 Last: 14.05.2026 23:09 Sources 1

About this happening: CVE-2026-20182 is an actively exploited authentication bypass in Cisco Catalyst SD-WAN Controller and Cisco Catalyst SD-WAN Manager, creating a path to administr...

Latest development: 14.05.2026 23:25

Cisco released a patch for CVE-2026-20182, giving organizations using Cisco Catalyst SD-WAN Controllers a way to block the authentication bypass before UAT-8616 can continue using it for administrative access, SSH key insertion, NETCONF changes, and root escalation.

Open Happening

Timeline

  1. 15.06.2026 20:12 3 articles · 1mo ago

    Cisco releases fixes for exploited Catalyst SD-WAN Manager file upload flaw

    Initial Disclosure

    Cisco released security updates for CVE-2026-20262 in Catalyst SD-WAN Manager, formerly SD-WAN vManage, after PSIRT became aware of exploitation earlier this month. The flaw affects all deployment types, including on-prem deployments, Cisco SD-WAN Cloud-Pro, Cisco SD-WAN Cloud (Cisco Managed), and Cisco SD-WAN for Government (FedRAMP), and an authenticated remote attacker could use crafted HTTP requests to an affected API endpoint to create or overwrite files and later elevate to root. Cisco also advised administrators to patch to the fixed releases and inspect vmanage-server, vmanage-appserver, and serviceproxy-access logs for index.jsp and .war upload attempts.

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