Is CVE-2026-39912 in the CISA KEV catalog?

No. CVE-2026-39912 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-39912?

CVE-2026-39912 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2026-39912?

CVE-2026-39912 has an EPSS score of 0.58% (44th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-39912?

No published fix for CVE-2026-39912 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-39912

CRITICAL

9.1

CVSS v3

NVD

Description

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.

CWE-201

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploit Intelligence

0.58%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Other references8

Related Vulnerabilities

Other CWE-201 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-60188	High	7.5	2.9%	-	-
CVE-2017-16026	Medium	5.9	2.6%	-	Fix
CVE-2017-2582	Medium	6.5	2.5%	-	Fix
CVE-2022-27779	Medium	5.3	2.4%	-	Fix
CVE-2020-26085	Critical	9.9	2.2%	-	Fix
CVE-2024-32825	High	7.5	2.0%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-14.