{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.1.9"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3c224f3ad814afea4fa3b16435a090d884c1d709"
            },
            {
              "fixed": "121511523f04882ec0c7447acd9b8ebcb8a47957"
            }
          ],
          "repo": "https://github.com/cedar2025/xboard",
          "type": "GIT"
        },
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.6.1"
              },
              {
                "last_affected": "1.7.4"
              },
              {
                "fixed": "1.7.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "1a0b09edd248ab5608df96d1f0da6fc7019cda50"
            },
            {
              "fixed": "0ca47622a50116d0ddd7ffb316b157afb57d25e8"
            }
          ],
          "repo": "https://github.com/v2board/v2board",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-201"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39912.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "bdb10bed32c5f37df2f0872c3cb354e9b7a293bd"
          },
          {
            "last_affected": "0ca47622a50116d0ddd7ffb316b157afb57d25e8"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "V2Board 1.6.1 through 1.7.4 and Xboard through 0.1.9 expose authentication tokens in HTTP response bodies of the loginWithMailLink endpoint when the login_with_mail_link_enable feature is active. Unauthenticated attackers can POST to the loginWithMailLink endpoint with a known email address to receive the full authentication URL in the response, then exchange the token at the token2Login endpoint to obtain a valid bearer token with complete account access including admin privileges.",
  "id": "CVE-2026-39912",
  "modified": "2026-07-15T01:49:11.465728015Z",
  "published": "2026-04-09T18:35:35.569Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Http/Controllers/V1/Passport/AuthController.php#L51"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Services/Auth/MailLinkService.php#L49"
    },
    {
      "type": "WEB",
      "url": "https://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e8/app/Http/Controllers/Passport/AuthController.php#L71"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39912.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39912"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposure-via-loginwithmaillink"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cedar2025/Xboard/pull/873"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/v2board/v2board/pull/981"
    },
    {
      "type": "FIX",
      "url": "https://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a47957"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cedar2025/Xboard"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/v2board/v2board"
    },
    {
      "type": "EVIDENCE",
      "url": "https://chocapikk.com/posts/2026/xboard-v2board-account-takeover/"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "v2board / Xboard Authentication Token Exposure via loginWithMailLink"
}