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 inc
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.
- 🔗 chocapikk.com/posts/2026/xboard-v2board-account-takeove…
- 🔗 github.com/v2board/v2board/pull/981
- 🔗 github.com/cedar2025/Xboard/pull/873
- 🔗 github.com/v2board/v2board/blob/0ca47622a50116d0ddd7…
- 🔗 github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a…
- 🔗 github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a…
- 🔗 github.com/cedar2025/Xboard/commit/121511523f04882ec…
- 🔗 www.vulncheck.com/advisories/v2board-xboard-authentication-…
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📊 Historien-Charts — Criticals-Trend · Vendors · EPSS-Verteilung
| Tier | CVEs | Anteil |
|---|---|---|
| ≥90 % | 785 | 0,2 % |
| ≥50 % | 3.559 | 0,9 % |
| ≥10 % | 13.142 | 3,2 % |
| <10 % | 396.069 | 95,8 % |
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 inc
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 lo