---
id: "CVE-2026-123495"
page: "https://infrastack.ai/live/CVE-2026-123495"
kind: "vulnerability"
aliases: ["CVE-2026-123495"]
title: "Vikunja: login endpoints accept cross-site form posts, enabling login CSRF"
severity: "medium"
cvss: 5.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "vikunja"]
not_affected_if: ["managed-hosting", "version-2.7.1-or-later"]
published_at: "2026-11-08T02:16:36+00:00"
first_seen_at: "2026-11-08T02:21:07+00:00"
updated_at: "2026-11-08T02:25:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123495", "first_seen_at": "2026-11-08T02:21:07+00:00"}]
exploit_sources: []
---

# Vikunja: login endpoints accept cross-site form posts, enabling login CSRF

Link for people: https://infrastack.ai/live/CVE-2026-123495 (this .md is for agents)

Vikunja 2.0.0 before 2.7.1 accepts form-encoded requests on its /api/v2 login and OIDC callback endpoints without CSRF or Origin checks. A malicious page can make a victim's browser log in as the attacker's account, so data the victim then adds lands in the attacker's account.

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

## How to check

- Check the installed Vikunja version; affected range is `2.0.0` up to but not including `2.7.1`.
- Look for a Vikunja instance on `/api/v2` login or OIDC callback endpoints reachable from the internet.

## Fix

- Vikunja: move to `2.7.1` or later.

## Timeline

- 2026-11-08T02:21:07+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123495

## Documents

- [advisory] Vendor advisory: github.com https://github.com/go-vikunja/vikunja/security/advisories/GHSA-frf4-3prf-3vch
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/vikunja-2.0.0-before-2.7.1-login-csrf-via-api-v2-login-and-oidc-callback

## From the sources

Vikunja 2.0.0 before 2.7.1 accepts form-encoded bodies on the /api/v2 login and OIDC callback endpoints without CSRF or Origin checks, enabling login cross-site request forgery. An attacker with an account can lure a victim to a page posting the attacker's credentials or OIDC code, switching the victim into the attacker's account and exposing data the victim then adds.

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