{
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    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-39912",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-10T20:16:59.517212Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-13T15:38:46.529Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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        {
          "defaultStatus": "unknown",
          "product": "v2board",
          "repo": "https://github.com/v2board/v2board",
          "vendor": "v2board",
          "versions": [
            {
              "lessThanOrEqual": "1.7.4",
              "status": "affected",
              "version": "1.6.1",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "0ca47622a50116d0ddd7ffb316b157afb57d25e8",
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          "product": "Xboard",
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          "vendor": "cedar2025",
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      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Valentin Lobstein (Chocapikk)"
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      ],
      "descriptions": [
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          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
              "value": "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.\u003cbr\u003e"
            }
          ],
          "value": "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."
        }
      ],
      "metrics": [
        {
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
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            "vulnAvailabilityImpact": "NONE",
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            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "value": "GENERAL"
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            "attackVector": "NETWORK",
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            "baseScore": 9.1,
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            "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:N",
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-201",
              "description": "CWE-201 Insertion of Sensitive Information Into Sent Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-09T18:51:49.345Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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          "url": "https://chocapikk.com/posts/2026/xboard-v2board-account-takeover/"
        },
        {
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            "issue-tracking",
            "mitigation"
          ],
          "url": "https://github.com/v2board/v2board/pull/981"
        },
        {
          "tags": [
            "issue-tracking",
            "mitigation"
          ],
          "url": "https://github.com/cedar2025/Xboard/pull/873"
        },
        {
          "tags": [
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          "url": "https://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e8/app/Http/Controllers/Passport/AuthController.php#L71"
        },
        {
          "tags": [
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          "url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Services/Auth/MailLinkService.php#L49"
        },
        {
          "tags": [
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          "url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Http/Controllers/V1/Passport/AuthController.php#L51"
        },
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          "tags": [
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          "url": "https://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a47957"
        },
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          "url": "https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposure-via-loginwithmaillink"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "v2board / Xboard Authentication Token Exposure via loginWithMailLink",
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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-39912",
    "datePublished": "2026-04-09T18:35:35.569Z",
    "dateReserved": "2026-04-07T20:57:06.209Z",
    "dateUpdated": "2026-04-13T15:38:46.529Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}