Vulnerability-Lookup

GHSA-P2JR-QV63-HJCH

Vulnerability from github – Published: 2026-10-21 18:33 – Updated: 2026-10-21 18:33

Details

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.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-76466"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-798"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-21T17:19:06Z",
    "severity": "CRITICAL"
  },
  "details": "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\u0026nbsp;root.\n\nThis 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.\nNote: Cisco Expressway Series refers to Cisco Expressway Core (Expressway-C) devices and Cisco Expressway Edge (Expressway-E) devices.",
  "id": "GHSA-p2jr-qv63-hjch",
  "modified": "2026-10-21T18:33:19Z",
  "published": "2026-10-21T18:33:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76466"
    },
    {
      "type": "WEB",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vcs-static-cred-hr7EWZ8t"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-76466 (GCVE-0-2026-76466)

Vulnerability from cvelistv5 – Published: 2026-10-21 16:14 – Updated: 2026-10-21 17:19

Title

Cisco Expressway Series Remote Code Execution Vulnerability

Summary

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.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-21 16:48 UTC

CWE

CWE-798 - Use of Hard-coded Credentials

Assigner

cisco CNA under the mitre root

CNA scorecard C 66/100 over 442 records in the last 180 days details

References

1 reference

URL	Tags
https://sec.cloudapps.cisco.com/security/center/c…

Impacted products

1 product

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

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-76466",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-21T16:48:49.979581Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-21T17:19:11.907Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Cisco TelePresence Video Communication Server (VCS) Expressway",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "X8.11.2"
            },
            {
              "status": "affected",
              "version": "X8.6"
            },
            {
              "status": "affected",
              "version": "X8.11.3"
            },
            {
              "status": "affected",
              "version": "X8.2.2"
            },
            {
              "status": "affected",
              "version": "X8.8.3"
            },
            {
              "status": "affected",
              "version": "X8.11.0"
            },
            {
              "status": "affected",
              "version": "X12.5.2"
            },
            {
              "status": "affected",
              "version": "X8.1.1"
            },
            {
              "status": "affected",
              "version": "X8.9"
            },
            {
              "status": "affected",
              "version": "X12.5.1"
            },
            {
              "status": "affected",
              "version": "X12.5.6"
            },
            {
              "status": "affected",
              "version": "X8.7.3"
            },
            {
              "status": "affected",
              "version": "X12.6.0"
            },
            {
              "status": "affected",
              "version": "X8.11.1"
            },
            {
              "status": "affected",
              "version": "X8.5"
            },
            {
              "status": "affected",
              "version": "X8.9.1"
            },
            {
              "status": "affected",
              "version": "X8.10.2"
            },
            {
              "status": "affected",
              "version": "X8.8.2"
            },
            {
              "status": "affected",
              "version": "X8.5.3"
            },
            {
              "status": "affected",
              "version": "X8.1"
            },
            {
              "status": "affected",
              "version": "X8.9.2"
            },
            {
              "status": "affected",
              "version": "X8.11.4"
            },
            {
              "status": "affected",
              "version": "X12.5.4"
            },
            {
              "status": "affected",
              "version": "X8.8.1"
            },
            {
              "status": "affected",
              "version": "X8.2.1"
            },
            {
              "status": "affected",
              "version": "X8.5.1"
            },
            {
              "status": "affected",
              "version": "X8.6.1"
            },
            {
              "status": "affected",
              "version": "X8.1.2"
            },
            {
              "status": "affected",
              "version": "X8.8"
            },
            {
              "status": "affected",
              "version": "X8.10.0"
            },
            {
              "status": "affected",
              "version": "X12.5.3"
            },
            {
              "status": "affected",
              "version": "X8.10.1"
            },
            {
              "status": "affected",
              "version": "X12.5.7"
            },
            {
              "status": "affected",
              "version": "X8.10.3"
            },
            {
              "status": "affected",
              "version": "X8.7.1"
            },
            {
              "status": "affected",
              "version": "X8.2"
            },
            {
              "status": "affected",
              "version": "X12.5.8"
            },
            {
              "status": "affected",
              "version": "X8.7"
            },
            {
              "status": "affected",
              "version": "X8.5.2"
            },
            {
              "status": "affected",
              "version": "X12.5.9"
            },
            {
              "status": "affected",
              "version": "X12.5.0"
            },
            {
              "status": "affected",
              "version": "X8.10.4"
            },
            {
              "status": "affected",
              "version": "X8.7.2"
            },
            {
              "status": "affected",
              "version": "X12.5.5"
            },
            {
              "status": "affected",
              "version": "X12.6.1"
            },
            {
              "status": "affected",
              "version": "X12.6.2"
            },
            {
              "status": "affected",
              "version": "X12.6.3"
            },
            {
              "status": "affected",
              "version": "X12.6.4"
            },
            {
              "status": "affected",
              "version": "X12.7.0"
            },
            {
              "status": "affected",
              "version": "X12.7.1"
            },
            {
              "status": "affected",
              "version": "X14.0.0"
            },
            {
              "status": "affected",
              "version": "X14.0.1"
            },
            {
              "status": "affected",
              "version": "X14.0.2"
            },
            {
              "status": "affected",
              "version": "X14.0.3"
            },
            {
              "status": "affected",
              "version": "X14.0.4"
            },
            {
              "status": "affected",
              "version": "X14.0.5"
            },
            {
              "status": "affected",
              "version": "X14.0.6"
            },
            {
              "status": "affected",
              "version": "X14.0.7"
            },
            {
              "status": "affected",
              "version": "X14.0.8"
            },
            {
              "status": "affected",
              "version": "X14.2.0"
            },
            {
              "status": "affected",
              "version": "X14.0.9"
            },
            {
              "status": "affected",
              "version": "X14.2.1"
            },
            {
              "status": "affected",
              "version": "X14.2.2"
            },
            {
              "status": "affected",
              "version": "X14.0.11"
            },
            {
              "status": "affected",
              "version": "X14.2.5"
            },
            {
              "status": "affected",
              "version": "X14.0.10"
            },
            {
              "status": "affected",
              "version": "X14.2.6"
            },
            {
              "status": "affected",
              "version": "X14.2.7"
            },
            {
              "status": "affected",
              "version": "X14.3.0"
            },
            {
              "status": "affected",
              "version": "X14.3.1"
            },
            {
              "status": "affected",
              "version": "X14.3.2"
            },
            {
              "status": "affected",
              "version": "X14.3.3"
            },
            {
              "status": "affected",
              "version": "X15.0.0"
            },
            {
              "status": "affected",
              "version": "X14.3.4"
            },
            {
              "status": "affected",
              "version": "X14.3.5"
            },
            {
              "status": "affected",
              "version": "X15.0.1"
            },
            {
              "status": "affected",
              "version": "X15.0.2"
            },
            {
              "status": "affected",
              "version": "X15.0.3"
            },
            {
              "status": "affected",
              "version": "X14.3.6"
            },
            {
              "status": "affected",
              "version": "X15.2.0"
            },
            {
              "status": "affected",
              "version": "X15.2.1"
            },
            {
              "status": "affected",
              "version": "X15.2.2"
            },
            {
              "status": "affected",
              "version": "X15.2.3"
            },
            {
              "status": "affected",
              "version": "X14.3.7"
            },
            {
              "status": "affected",
              "version": "X15.2.4."
            },
            {
              "status": "affected",
              "version": "X15.2.4"
            },
            {
              "status": "affected",
              "version": "X15.3.0"
            },
            {
              "status": "affected",
              "version": "X15.3.1"
            },
            {
              "status": "affected",
              "version": "X15.3.2"
            },
            {
              "status": "affected",
              "version": "X15.4.0"
            },
            {
              "status": "affected",
              "version": "X15.5.0"
            },
            {
              "status": "affected",
              "version": "X15.5.1"
            },
            {
              "status": "affected",
              "version": "X15.5.2"
            },
            {
              "status": "affected",
              "version": "X15.5.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0026nbsp;root.\r\n\r\nThis 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.\r\nNote: Cisco Expressway Series refers to Cisco Expressway Core (Expressway-C) devices and Cisco Expressway Edge (Expressway-E) devices."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-798",
              "description": "Use of Hard-coded Credentials",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T16:14:19.225Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-vcs-static-cred-hr7EWZ8t",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vcs-static-cred-hr7EWZ8t"
        }
      ],
      "source": {
        "advisory": "cisco-sa-vcs-static-cred-hr7EWZ8t",
        "defects": [
          "CSCww27732"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Cisco Expressway Series Remote Code Execution Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2026-76466",
    "datePublished": "2026-10-21T16:14:19.225Z",
    "dateReserved": "2026-08-19T12:02:03.638Z",
    "dateUpdated": "2026-10-21T17:19:11.907Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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