Cisco Security Advisory
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CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X
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A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface.
This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cimc-xss-7EhBFxBp
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Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco IMC, regardless of device configuration:
- 5000 Series Enterprise Network Compute Systems (ENCS) (CSCwu66661)
- Catalyst 8300 Series Edge uCPE (CSCwu66669)
- UCS C-Series M5 and M6 Rack Servers in standalone mode (CSCwt96899)
- UCS E-Series Servers M3 (CSCwu66661)
- UCS E-Series Servers M6 (CSCwu66669)
- UCS S-Series Storage Servers in standalone mode (CSCwt96899)
Cisco appliances that are based on a preconfigured version of one of the Cisco UCS C-Series Servers that are in the preceding list are also affected by these vulnerabilities if they expose access to the Cisco IMC UI. At the time of publication, this included the following Cisco products:
- Application Policy Infrastructure Controller (APIC) Servers
- Business Edition 6000 and 7000 Appliances
- Catalyst Center Appliances
- Cisco Telemetry Broker Appliances
- Cloud Services Platform (CSP) 5000 Series
- Common Services Platform Collector (CSPC) Appliances
- Connected Mobile Experiences (CMX) Appliances
- Connected Safety and Security UCS Platform Series Servers
- Cyber Vision Center Appliances
- Expressway Series Appliances
- HyperFlex Edge Nodes
- HyperFlex Nodes in HyperFlex Datacenter without Fabric Interconnect (DC-No-FI) deployment mode
- IEC6400 Edge Compute Appliances
- IOS XRv 9000 Appliances
- Meeting Server 1000 Appliances
- Nexus Dashboard Appliances
- Prime Infrastructure Appliances
- Prime Network Registrar Jumpstart Appliances
- Secure Endpoint Private Cloud Appliances
- Secure Firewall Management Center (FMC) Appliances
- Secure Malware Analytics Appliances
- Secure Network Analytics Appliances
- Secure Network Server (ISE SNS) Appliances
- Secure Workload Servers
For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has determined that this vulnerability does not affect the following Cisco products:
- UCS B-Series Blade Servers
- UCS C-Series M7 and M8 Rack Servers in standalone mode
- UCS C-Series Rack Servers with Fabric Interconnects in UCS Manager or Intersight Managed Mode (IMM)
- UCS S-Series Storage Servers with Fabric Interconnects in UCS Manager or Intersight Managed Mode (IMM)
- UCS X-Series Modular System
- Unified Edge
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There are no workarounds that address this vulnerability.
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Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To fully remediate this vulnerability and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory.
Fixed Releases
At the time of publication, the release information in the following tables was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability that is described in this advisory and which release included the fix for this vulnerability.
5000 Series ENCS and Catalyst 8300 Series Edge uCPE
Note: Upgrading Cisco IMC on Cisco 5000 Series ENCS and Cisco Catalyst 8300 Series Edge uCPE requires upgrading Cisco Enterprise NFV Infrastructure Software (NFVIS) on the platforms. Cisco IMC is upgraded as part of the firmware auto-upgrade process.
Cisco NFVIS Release First Fixed Release (ENCS) Earlier than 4.12 Migrate to a fixed release. 4.12 4.12.8 4.13 Migrate to a fixed release. 4.14 Migrate to a fixed release. 4.15 4.15.6 Cisco NFVIS Release First Fixed Release (uCPE) 4.12 4.12.8 4.13 Migrate to a fixed release. 4.14 Migrate to a fixed release. 4.15 4.15.6 4.16 Migrate to a fixed release. 4.18 4.18.5 (Sep 2026) 26.1 26.1.2 UCS C-Series M5 Rack Server
Cisco UCS Server Software Release First Fixed Release Earlier than 4.2 Migrate to a fixed release. 4.2 4.2(3r) 4.3 4.3(2.260020) UCS C-Series M6 Rack Server
Cisco UCS Server Software Release First Fixed Release Earlier than 4.2 Migrate to a fixed release. 4.2 4.2(3r) 4.3 4.3(6.260054) 6.0 6.0(2.260143)1 1. The fixed 6.0(2.260143) Host Upgrade Utility (HUU) ISO release includes the Cisco IMC 6.0(2.260094) packaged release. After upgrading to this fixed release, the Cisco IMC UI Dashboard page will show 6.0(2.260094) under Firmware Version. The Last HSU bundle used field under Administration > Firmware Management will display the fixed 6.0(2.260143) release.UCS E-Series M3
Cisco UCSE Software Release First Fixed Release 3.2 and earlier 3.2.18.1 UCS E-Series M6
Cisco UCSE Software Release First Fixed Release 4.15 and earlier 4.15.4 UCS S-Series Storage Server
Cisco UCS Server Software Release First Fixed Release Earlier than 4.3 Migrate to a fixed release. 4.3 4.3(6.260054) Note: For Cisco appliances that are based on a preconfigured version of one of the Cisco UCS C-Series Servers in the preceding tables, administrators can perform a direct upgrade of Cisco IMC to one of the fixed releases mentioned in the preceding tables. For instructions, see the Cisco Host Upgrade Utility (HUU) User Guide. The exceptions are the appliances that are listed in the following table. For these appliances, follow the instructions in the Remediation column:
Cisco Hardware Platform First Fixed Firmware Release Remediation Cisco Telemetry Broker Appliances 6.0(2.260143)1 Install the firmware update CTB-FIRMWARE-6.0.2.260143-M6.iso. IEC6400 Edge Compute Appliances 4.3(6.260054) Apply the HUU upgrade using IEC6400-HUU-4.3.6-260054.img. Secure Endpoint Private Cloud Appliances 4.3(2.260020) (M5)
4.3(6.260054) (M6)Follow the steps documented in the TechNote. Secure Firewall Management (FMC) Center Appliances 4.3(2.260020) (M5)
6.0(2.260143)1(M6)Apply the Hotfix GA. Secure Malware Analytics Appliances 4.3(2.260020) (M5)
4.3(6.260054) (M6)Update the firmware using the Out-of-Band Firmware Update ISO procedure. Secure Network Analytics Appliances 4.3(2.260020) (M5)
6.0(2.260143)1(M6)For M5, install the firmware update patch-common-SNA-FIRMWARE-4.3.2.260020-M5-v2-01.swu.
For M6, install the firmware update patch-common-SNA-FIRMWARE-6.0.2260143-M6-v2-01.swu.Secure Network Server (ISE SNS) Appliances 4.3(2.260020) (M5)
6.0(2.260143)1(M6)Apply the BIOS and HUU upgrade as documented in the Firmware Upgrade Guide for Cisco Secure Network Server 3600 Series or Cisco Secure Network Server 3700 Series. 1. The fixed 6.0(2.260143) firmware release includes the Cisco IMC 6.0(2.260094) packaged release. After upgrading to this fixed release, the Cisco IMC UI Dashboard page will show 6.0(2.260094) under Firmware Version. The Last HSU bundle used field under Administration > Firmware Management will display the fixed 6.0(2.260143) release.The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.
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The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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Cisco would like to thank Grzegorz Misiun of ING Hubs Poland for reporting this vulnerability.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
For additional information on Cisco's vulnerability management, disclosure cadence, and software patching strategy, see Cisco's Transition to a Risk-Based Vulnerability Disclosure Model.
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Show LessVersion Description Section Status Date 1.0 Initial public release. — Final 2026-AUG-05
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SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT
The Cisco Support and Downloads page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid.
Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC). Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.
When considering software upgrades, customers are advised to regularly consult the advisories for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
LEGAL DISCLAIMER DETAILS
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Copies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy for more information.