CVE-2026-39912 (GCVE-0-2026-39912)

Vulnerability from cvelistv5 – Published: 2026-04-09 18:35 – Updated: 2026-07-14 20:00
VLAI
Title
v2board / Xboard Authentication Token Exposure via loginWithMailLink
Summary
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.
Severity
9.1 (Critical)
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
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-10 20:16 UTC
CWE
  • CWE-201 - Insertion of Sensitive Information Into Sent Data
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6373 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
v2board v2board Affected: 1.6.1 , ≤ 1.7.4 (semver)
Affected: bdb10bed32c5f37df2f0872c3cb354e9b7a293bd , ≤ 0ca47622a50116d0ddd7ffb316b157afb57d25e8 (git)
guessed Create a notification for this product.
cedar2025 Xboard Affected: 0 , ≤ 0.1.9 (semver)
Unaffected: 121511523f04882ec0c7447acd9b8ebcb8a47957 (git)
guessed Create a notification for this product.
Credits
Valentin Lobstein (Chocapikk)
Show details on NVD website
To clipboard 

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                "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",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            },
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 9.1,
                "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:N",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-201",
                  "description": "CWE-201 Insertion of Sensitive Information Into Sent Data",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-14T20:00:18.922Z",
            "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
            "shortName": "VulnCheck"
          },
          "references": [
            {
              "tags": [
                "technical-description",
                "exploit"
              ],
              "url": "https://chocapikk.com/posts/2026/xboard-v2board-account-takeover/"
            },
            {
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/v2board/v2board/pull/981"
            },
            {
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/cedar2025/Xboard/pull/873"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e8/app/Http/Controllers/Passport/AuthController.php#L71"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Services/Auth/MailLinkService.php#L49"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Http/Controllers/V1/Passport/AuthController.php#L51"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a47957"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposure-via-loginwithmaillink"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "v2board / Xboard Authentication Token Exposure via loginWithMailLink",
          "x_generator": {
            "engine": "vulncheck"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-39912",
        "datePublished": "2026-04-09T18:35:35.569Z",
        "dateReserved": "2026-04-07T20:57:06.209Z",
        "dateUpdated": "2026-07-14T20:00:18.922Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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