{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "10.11.0"
              },
              {
                "fixed": "10.11.13"
              },
              {
                "introduced": "11.3.0"
              },
              {
                "fixed": "11.3.3"
              },
              {
                "introduced": "11.4.0"
              },
              {
                "fixed": "11.4.3"
              },
              {
                "introduced": "11.5.0"
              },
              {
                "fixed": "11.5.1"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "5b955468ea1ea8b56c0fb10feb258a36a767d7bb"
            },
            {
              "fixed": "bc1a2b34b1f96d48465ff662f9b4751db1c900de"
            },
            {
              "introduced": "d27a2195068ddfa3ce17cf470f9739e4edb94b83"
            },
            {
              "fixed": "e808e22f49be6bf0a48307e2b3115830b7126a12"
            },
            {
              "introduced": "2a1ac98bd3fae587927adf9340ba266c8c02018e"
            },
            {
              "fixed": "f03fea5167ae4d4019a7d6d5c53030fd969e7eb1"
            },
            {
              "introduced": "9f2616376582893035a7e3cb38b0fab648bba4e8"
            },
            {
              "fixed": "c2d85727d25e63f1647aa3378d0dca2a22216b30"
            }
          ],
          "repo": "https://github.com/mattermost/mattermost",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Mattermost",
    "cwe_ids": [
      "CWE-367"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3590.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "10.11.0"
          },
          {
            "last_affected": "10.11.12"
          },
          {
            "introduced": "11.5.0"
          },
          {
            "last_affected": "11.5.0"
          },
          {
            "introduced": "11.4.0"
          },
          {
            "last_affected": "11.4.2"
          },
          {
            "introduced": "11.3.0"
          },
          {
            "last_affected": "11.3.2"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Mattermost versions 10.11.x \u003c= 10.11.12, 11.5.x \u003c= 11.5.0, 11.4.x \u003c= 11.4.2, 11.3.x \u003c= 11.3.2 fail to enforce atomic single-use consumption of guest magic link tokens, which allows an attacker with access to a valid magic link to establish multiple independent authenticated sessions via concurrent requests.. Mattermost Advisory ID: MMSA-2026-00624",
  "id": "CVE-2026-3590",
  "modified": "2026-07-08T05:35:55.856380749Z",
  "published": "2026-04-15T11:00:14.880Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3590.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://mattermost.com/security-updates"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3590"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Race Condition in Guest Magic Link Authentication Allows Token Reuse"
}