Vulnerability in Go-Vikunja Vikunja
CVE-2026-123497
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-wqw2-rgwv-99qx) (vendor-advisory)
- VulnCheck Advisory: Vikunja veans before 2.7.1 HTTPS to HTTP Downgrade in Server Discovery (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123497?
- CVE-2026-123497 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Cleartext Transmission of Sensitive Information. CVSS score: 6.8/10. Published 2026-11-08.
- How severe is CVE-2026-123497?
- Medium severity. CVSS v3 base score is 6.8 out of 10.