Regex DoS from a malicious server enrolled in Desktop

{
  "id": "a1a7afb508c2ce0de90b86b64ae08838d3b29dbd217a88d7684368b4b05755b4",
  "url": "https://osv.dev/vulnerability/CVE-2023-5876",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Regex DoS from a malicious server enrolled in Desktop",
    "summary": "Mattermost fails to properly validate a RegExp built off the server URL path, allowing an attacker in control of an enrolled server to mount a Denial Of Service.",
    "evidence": "osv:CVE-2023-5876",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2023-5876",
      "aliases": [
        "CVE-2023-5876"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mattermost/desktop",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "db8645b21b86fe368938d53b202c1014a929ab45"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.5.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.5.1-rc.4",
            "v5.5.1-rc.3",
            "v5.5.1-rc.2",
            "v5.5.0",
            "v5.5.0-mas.1",
            "v5.5.0-rc.2",
            "v5.5.0-rc.1",
            "v4.7.0-beta2",
            "beta2",
            "4.7.0-beta",
            "v1.3.0-rc2",
            "v1.3.0",
            "v1.3.0-rc1",
            "v1.2.0",
            "v1.1.1",
            "v1.1.0",
            "v1.0.7",
            "v1.0.6",
            "v1.0.5",
            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v0.5.1",
            "v0.5.0",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-5876.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.100506756Z",
      "provider": "osv",
      "references": [
        "https://mattermost.com/security-updates",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/5xxx/CVE-2023-5876.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-5876"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "Mattermost",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "5.5.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/5xxx/CVE-2023-5876.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-5876",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521937,
  "published_at": "2023-11-02T08:26:01.611+00:00"
}