Vulnerability in Go-Vikunja Vikunja
CVE-2026-123498
Vikunja veans before 2.7.1 contains a prompt injection vulnerability that allows project members with write access to inject instructions by setting project titles or task content rendered verbatim inside the coding agent's authoritative instruction block. Attackers can craft ProjectTitle or task descriptions that the prime hook loads on SessionStart and PreCompact, causing the agent to modify the developer's checkout or run commands.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/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
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-cvh3-hf56-g9xm) (vendor-advisory)
- VulnCheck Advisory: Vikunja veans before 2.7.1 Prompt Injection via Project and Task Metadata (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123498?
- CVE-2026-123498 is a low-severity vulnerability in Go-Vikunja Vikunja, classified under CWE-1427. CVSS score: 3.7/10. Published 2026-11-08.
- How severe is CVE-2026-123498?
- Low severity. CVSS v3 base score is 3.7 out of 10.