Cisco Expressway Series Information Disclosure Vulnerability

Description

A vulnerability in Cisco Expressway Series could allow an unauthenticated, remote attacker to obtain sensitive information from an affected device. This vulnerability is due to insufficient authorization checks of HTTP requests during Mobile and Remote Access (MRA) provisioning. An attacker could exploit this vulnerability by submitting a crafted URL request to an affected device. A successful exploit could allow the attacker to access sensitive information that they would otherwise not have authorization to access. Note: Cisco Expressway Series refers to Cisco Expressway Core (Expressway-C) devices and Cisco Expressway Edge (Expressway-E) devices. 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-expressway-inf-disc-vvYqgSTS This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of October 21, 2026, Security Advisories . In addition, for further documentation of improvements and fixes in Cisco Expressway Series see Cisco Expressway Series Security Hardening Release: October 2026 . Security Impact Rating: Medium CVE: CVE-2026-76435

What to do

Install the fixed versions listed in the official advisory. If you cannot update right away, apply the workarounds or mitigations it describes and limit access to the affected service.

Details

Vendor

Cisco

Product

Cisco Expressway

CVE

CVE-2026-76435

Affected versions

Cisco TelePresence Video Communication Server (VCS) Expressw 8.11: 5 versions, from X8.11.0 to X8.11.4
Cisco TelePresence Video Communication Server (VCS) Expressw 8.6: X8.6; X8.6.1
Cisco TelePresence Video Communication Server (VCS) Expressw 8.2: X8.2; X8.2.1; X8.2.2
Cisco TelePresence Video Communication Server (VCS) Expressw 8.8: 4 versions, from X8.8 to X8.8.3
Cisco TelePresence Video Communication Server (VCS) Expressw 12.5: 10 versions, from X12.5.0 to X12.5.9
Cisco TelePresence Video Communication Server (VCS) Expressw 8.1: X8.1; X8.1.1; X8.1.2
Cisco TelePresence Video Communication Server (VCS) Expressw 8.9: X8.9; X8.9.1; X8.9.2
Cisco TelePresence Video Communication Server (VCS) Expressw 8.7: 4 versions, from X8.7 to X8.7.3
Cisco TelePresence Video Communication Server (VCS) Expressw 12.6: 5 versions, from X12.6.0 to X12.6.4
Cisco TelePresence Video Communication Server (VCS) Expressw 8.5: 4 versions, from X8.5 to X8.5.3
Cisco TelePresence Video Communication Server (VCS) Expressw 8.10: 5 versions, from X8.10.0 to X8.10.4
Cisco TelePresence Video Communication Server (VCS) Expressw 12.7: X12.7.0; X12.7.1
Cisco TelePresence Video Communication Server (VCS) Expressw 14.0: 12 versions, from X14.0.0 to X14.0.11
Cisco TelePresence Video Communication Server (VCS) Expressw 14.2: 6 versions, from X14.2.0 to X14.2.7
Cisco TelePresence Video Communication Server (VCS) Expressw 14.3: 8 versions, from X14.3.0 to X14.3.7
Cisco TelePresence Video Communication Server (VCS) Expressw 15.0: 4 versions, from X15.0.0 to X15.0.3
Cisco TelePresence Video Communication Server (VCS) Expressw 15.2: 6 versions, from X15.2.0 to X15.2.4
Cisco TelePresence Video Communication Server (VCS) Expressw 15.3: X15.3.0; X15.3.1; X15.3.2
Cisco TelePresence Video Communication Server (VCS) Expressw 15.4: X15.4.0
Cisco TelePresence Video Communication Server (VCS) Expressw 15.5: X15.5.0; X15.5.1; X15.5.2 (from the advisory and NVD; check the exact builds in the official advisory)

CVSS score

5.3

Actively exploited

Not known at this time

Source

Cisco PSIRT – original advisory

Published

October 21, 2026

The description and the recommended action are quoted from the public advisory (the action is our generic advice); severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.