Answer in brief
CVE-2026-39912 records a Critical severity (CVSS 9.1) vulnerability in v2board / Xboard Authentication Token Exposure via loginWithMailLink. The current sources do not mark it as known exploited. The current feed maps v2board/v2board (generic), cedar2025/Xboard (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps v2board/v2board (generic), cedar2025/Xboard (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| v2board/v2boardgeneric | >=1.6.1 <=1.7.4 || >=bdb10bed32c5f37df2f0872c3cb354e9b7a293bd <=0ca47622a50116d0ddd7ffb316b157afb57d25e8 | Not reported |
| cedar2025/Xboardgeneric | >=0 <=0.1.9 | Not reported |
Published upstream
Apr 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 28, 2026
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.
Quoted source text, attributed separately from HOL analysis.