What is CVE-2026-33315?

CVE-2026-33315 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 4.3/10. Published 2026-03-24.

How severe is CVE-2026-33315?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Go-Vikunja Vikunja

CVE-2026-33315

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.0, the Caldav endpoint allows login using Basic Authentication, which in turn allows users to bypass the TOTP on 2FA-enabled accounts. The user can then access standard project information that would normally be protected behind 2FA (if enabled), such as project name, description, etc. Version 2.2.0 patches the issue.

Published 2026-03-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (35.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Go-Vikunja Vikunja — versions < 2.2.0
Vikunja

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

References

github.com/go-vikunja/vikunja/security/advisories/GHSA-47cr-f226-r4pq (Exploit, Mitigation, Vendor Advisory)
github.com/go-vikunja/vikunja/commit/cdf5d30a425d032f749b78b98b828f25ad882615 (Patch)
vikunja.io/changelog/vikunja-v2.2.0-was-released (Release Notes)

Frequently asked questions

What is CVE-2026-33315?: CVE-2026-33315 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 4.3/10. Published 2026-03-24.
How severe is CVE-2026-33315?: Medium severity. CVSS v3 base score is 4.3 out of 10.