What is CVE-2026-123529?

CVE-2026-123529 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 4.6/10. Published 2026-11-08.

How severe is CVE-2026-123529?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Vulnerability in Go-Vikunja Vikunja

CVE-2026-123529

Vikunja before 2.7.1 contains a stored CSS injection vulnerability that allows authenticated users with project write access to inject arbitrary CSS via unsanitized table-cell data-background-color attributes. Attackers can store crafted task descriptions or comments to render full-viewport phishing overlays or force zero-click outbound background-image requests that deanonymize viewers.

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

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/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

Go-Vikunja Vikunja

Weakness classification (CWE)

CWE-1021 — Improper Restriction of Rendered UI Layers or Frames (Clickjacking)

References

GitHub Security Advisory (GHSA-p23m-cq25-pc4j) (vendor-advisory)
VulnCheck Advisory: Vikunja before 2.7.1 Stored CSS Injection via TipTap Table Cell data-background-color (third-party-advisory)

Frequently asked questions

What is CVE-2026-123529?: CVE-2026-123529 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 4.6/10. Published 2026-11-08.
How severe is CVE-2026-123529?: Medium severity. CVSS v3 base score is 4.6 out of 10.