Cisco TelePresence Video Communication Server Expressway Database Service certificate validation

Summaryinfo

A vulnerability classified as problematic has been found in Cisco TelePresence Video Communication Server Expressway. This affects an unknown part of the component Database Service. Performing a manipulation results in certificate validation. This vulnerability is cataloged as CVE-2026-76466. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Cisco TelePresence Video Communication Server Expressway. This affects some unknown processing of the component Database Service. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity. The summary by CVE is:

A vulnerability in the database service feature of Cisco Expressway Series could allow an unauthenticated, remote attacker with network access to a Cisco Expressway device to execute arbitrary operating system commands as root. This vulnerability is due to the use of persistent cookies. Additionally, there is insufficient validation of client certificates when the TLS Verify Mode is set to Enabled for clustering, which means that client certificates are not validated. An attacker with possession of the cookies could exploit this vulnerability by connecting to the database service and invoking specific remote procedure call (RPC) commands. A successful exploit could allow the attacker to execute arbitrary commands as root on the underlying operating system of an affected device. Note: Cisco Expressway Series refers to Cisco Expressway Core (Expressway-C) devices and Cisco Expressway Edge (Expressway-E) devices.

It is possible to read the advisory at sec.cloudapps.cisco.com. This vulnerability is uniquely identified as CVE-2026-76466 since 08/19/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/21/2026). The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Unified Communication Software

Vendor

• Cisco

Name

• TelePresence Video Communication Server Expressway

Version

• X8.1
• X8.1.1
• X8.1.2
• X8.2
• X8.2.1
• X8.2.2
• X8.5
• X8.5.1
• X8.5.2
• X8.5.3
• X8.6
• X8.6.1
• X8.7
• X8.7.1
• X8.7.2
• X8.7.3
• X8.8
• X8.8.1
• X8.8.2
• X8.8.3
• X8.9
• X8.9.1
• X8.9.2
• X8.10.0
• X8.10.1
• X8.10.2
• X8.10.3
• X8.10.4
• X8.11.0
• X8.11.1
• X8.11.2
• X8.11.3
• X8.11.4
• X12.5.0
• X12.5.1
• X12.5.2
• X12.5.3
• X12.5.4
• X12.5.5
• X12.5.6
• X12.5.7
• X12.5.8
• X12.5.9
• X12.6.0
• X12.6.1
• X12.6.2
• X12.6.3
• X12.6.4
• X12.7.0
• X12.7.1
• X14.0.0
• X14.0.1
• X14.0.2
• X14.0.3
• X14.0.4
• X14.0.5
• X14.0.6
• X14.0.7
• X14.0.8
• X14.0.9
• X14.0.10
• X14.0.11
• X14.2.0
• X14.2.1
• X14.2.2
• X14.2.5
• X14.2.6
• X14.2.7
• X14.3.0
• X14.3.1
• X14.3.2
• X14.3.3
• X14.3.4
• X14.3.5
• X14.3.6
• X14.3.7
• X15.0.0
• X15.0.1
• X15.0.2
• X15.0.3
• X15.2.0
• X15.2.1
• X15.2.2
• X15.2.3
• X15.2.4
• X15.2.4.
• X15.3.0
• X15.3.1
• X15.3.2
• X15.4.0
• X15.5.0
• X15.5.1
• X15.5.2
• X15.5.3

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

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