What is CVE-2026-123506?

CVE-2026-123506 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-11-08.

How severe is CVE-2026-123506?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Go-Vikunja Vikunja

CVE-2026-123506

Vikunja from 2.2.0 before 2.7.1 contains an authorization bypass vulnerability that allows holders of tokens scoped only to projects_webhooks to manage the owner's user-level webhooks by supplying user_id in request bodies. Attackers can register user webhooks to their own receiver to obtain reminders and task payloads from all owner projects, and read, change or delete existing user webhooks.

Vulnerability class: Broken Access Control

Published 2026-11-08 · last modified 2026-11-08.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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

Go-Vikunja Vikunja

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

GitHub Security Advisory (GHSA-5f6v-j6xm-wwj9) (vendor-advisory)
VulnCheck Advisory: Vikunja 2.2.0 before 2.7.1 Token Scope Bypass via Project Webhook Endpoints (third-party-advisory)

Frequently asked questions

What is CVE-2026-123506?: CVE-2026-123506 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-11-08.
How severe is CVE-2026-123506?: Medium severity. CVSS v3 base score is 5.4 out of 10.