CVE-2026-123497

MEDIUM 6.8

Vikunja veans before 2.7.1 HTTPS to HTTP Downgrade in Server Discovery

CVSS Score

6.8

EPSS Score

0.0%

EPSS Percentile

0th

Vikunja veans before 2.7.1 contains a protocol downgrade vulnerability in serverCandidates that allows on-path attackers to force plain HTTP during veans init and login. Attackers can block HTTPS ports so discovery accepts an unverified HTTP response, capturing passwords, TOTP codes or bot tokens and persisting cleartext API traffic.

CWE	CWE-319
Vendor	go-vikunja
Product	vikunja
Published	Nov 8, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

go-vikunja / vikunja

0 < 2.7.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-wqw2-rgwv-99qx vulncheck.com: https://www.vulncheck.com/advisories/vikunja-veans-before-2.7.1-https-to-http-downgrade-in-server-discovery