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CVE-2026-39912

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ddd4e4d9d0162bd614ad82bf25ea112c137b01c24728005d0f758f386f892579
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unknown","packageURL":"pkg:github/v2board/v2board","product":"v2board","repo":"https://github.com/v2board/v2board","vendor":"v2board","versions":[{"lessThanOrEqual":"1.7.4","status":"affected","version":"1.6.1","versionType":"semver"},{"lessThanOrEqual":"0ca47622a50116d0ddd7ffb316b157afb57d25e8","status":"affected","version":"bdb10bed32c5f37df2f0872c3cb354e9b7a293bd","versionType":"git"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/affected/0

{"defaultStatus":"unaffected","packageURL":"pkg:github/cedar2025/Xboard","product":"Xboard","repo":"https://github.com/cedar2025/Xboard","vendor":"cedar2025","versions":[{"lessThanOrEqual":"0.1.9","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"121511523f04882ec0c7447acd9b8ebcb8a47957","versionType":"git"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/affected/1
cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9.1,"baseSeverity":"CRITICAL","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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpac…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"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"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

2 source assertions
{"defaultStatus":"unknown","packageURL":"pkg:github/v2board/v2board","product":"v2board","repo":"https://github.com/v2board/v2board","vendor":"v2board","versions":[{"lessThanOrEqual":"1.7.4","status":"affected","version":"1.6.1","versionType":"semver"},{"lessThanOrEqual":"0ca47622a50116d0ddd7ffb316b157afb57d25e8","status":"affected","version":"bdb10bed32c5f37df2f0872c3cb354e9b7a293bd","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/affected/0
{"defaultStatus":"unaffected","packageURL":"pkg:github/cedar2025/Xboard","product":"Xboard","repo":"https://github.com/cedar2025/Xboard","vendor":"cedar2025","versions":[{"lessThanOrEqual":"0.1.9","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"121511523f04882ec0c7447acd9b8ebcb8a47957","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/affected/1

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9.1,"baseSeverity":"CRITICAL","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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpac…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-201","description":"CWE-201 Insertion of Sensitive Information Into Sent Data","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/problemTypes/0/descriptions/0

Source references

8 source assertions
{"tags":["technical-description","exploit"],"url":"https://chocapikk.com/posts/2026/xboard-v2board-account-takeover/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/references/0
{"tags":["related"],"url":"https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Http/Controllers/V1/Passport/AuthController.php#L51"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/references/5
{"tags":["related"],"url":"https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Services/Auth/MailLinkService.php#L49"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/references/4
{"tags":["patch"],"url":"https://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a47957"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/references/6
{"tags":["issue-tracking"],"url":"https://github.com/cedar2025/Xboard/pull/873"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/references/2
{"tags":["related"],"url":"https://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e8/app/Http/Controllers/Passport/AuthController.php#L71"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/references/3
{"tags":["issue-tracking"],"url":"https://github.com/v2board/v2board/pull/981"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/references/1
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposure-via-loginwithmaillink"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27e88135963de882e1d60eb2109709acbb3a87d3e2822e9555c20f89421cc9a4 · sha256:8ee0c6b6fb7391bb… · /containers/cna/references/7

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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