Auth bypass in Go-Vikunja Vikunja
CVE-2026-123524
Vikunja from 0.23.0 before 2.7.1 contains an information disclosure vulnerability that allows project collaborators with write access to read tasks from inaccessible projects by registering webhooks. Because webhook payloads are built with the triggering user's permissions, attackers receive related_tasks titles, descriptions and metadata from private projects whenever another user modifies a linked task.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/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-66cq-j6rw-pjch) (vendor-advisory)
- VulnCheck Advisory: Vikunja 0.23.0 before 2.7.1 Information Disclosure via Webhook related_tasks Payload (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123524?
- CVE-2026-123524 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Incorrect Authorization. CVSS score: 5.7/10. Published 2026-11-08.
- How severe is CVE-2026-123524?
- Medium severity. CVSS v3 base score is 5.7 out of 10.