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    CVE-2026-76466

    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.

    Published:Oct 21, 2026
    Last Modified:Oct 22, 2026
    EPS:Oct 21, 2026
    EPSS Score:0.00381
    CVSS Score:9.8

    Affected Products

    Vendor
    Cisco
    Product
    Expressway Series

    Exploits

    https://github.com/emirwtz/CVE-2026-76466https://github.com/mehmet-emir-eroglu/CVE-2026-76466

    Common Weakness Enumeration

    CWE-798 Use of Hard-coded Credentials

    Related CVEs

    CVE-2026-76497 (CVSS 6.6) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series s…
    CVE-2026-76496 (CVSS 7) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series s…
    CVE-2026-76495 (CVSS 7.8) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series s…
    CVE-2026-76494 (CVSS 7.8) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series s…
    CVE-2026-76493 (CVSS 7.5) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series s…
    CVE-2026-76490 (CVSS 8.6) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series s…
    CVE-2026-76492 (CVSS 7.5) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series s…
    CVE-2026-76491 (CVSS 7.5) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series s…
    CVE-2026-76435 (CVSS 5.3) — A vulnerability in Cisco Expressway Series could allow an unauthenticated, remote attacker to obtain sensitive…
    CVE-2019-1722 (CVSS 6.5) — A vulnerability in the FindMe feature of Cisco Expressway Series and Cisco TelePresence Video Communication Se…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High