---
id: "CVE-2026-123529"
page: "https://infrastack.ai/live/CVE-2026-123529"
kind: "vulnerability"
aliases: ["CVE-2026-123529"]
title: "Vikunja: stored CSS injection in task descriptions enables phishing overlays"
severity: "medium"
cvss: 5.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "task-management", "vikunja"]
not_affected_if: ["managed-hosting-patched", "read-only-projects", "version-2.7.1-or-later"]
published_at: "2026-11-08T02:16:42+00:00"
first_seen_at: "2026-11-08T02:21:09+00:00"
updated_at: "2026-11-08T02:25:25+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123529", "first_seen_at": "2026-11-08T02:21:09+00:00"}]
exploit_sources: []
---

# Vikunja: stored CSS injection in task descriptions enables phishing overlays

Link for people: https://infrastack.ai/live/CVE-2026-123529 (this .md is for agents)

Vikunja, a self-hosted task manager, fails to sanitize a table-cell data-background-color attribute, so CSS can be injected through stored task descriptions or comments. An attacker with project write access can display full-screen phishing overlays to other users or trigger background-image requests that reveal a viewer's IP address and identity.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Vikunja version; `2.7.1` or later is not affected by this flaw.
- Look for who holds project write access on self-hosted Vikunja instances.

## Fix

- Vikunja: move to `2.7.1` or later.

## Timeline

- 2026-11-08T02:21:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123529

## Documents

- [advisory] Vendor advisory: github.com https://github.com/go-vikunja/vikunja/security/advisories/GHSA-p23m-cq25-pc4j
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/vikunja-before-2.7.1-stored-css-injection-via-tiptap-table-cell-data-background-color

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_