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
EPSS: 0.002 (5.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-wqw2-rgwv-99qx (vendor-advisory)
- www.vulncheck.com/advisories/vikunja-veans-before-2.7.1-https-to-http-downgrade… (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.