Vikunja has Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers

{
  "id": "2e76d10ae3cb0c789d08b9cb63d0af83991e028ec3bf745ba964013b55023da3",
  "url": "https://osv.dev/vulnerability/CVE-2026-29794",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Vikunja has Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers",
    "summary": "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.",
    "evidence": "osv:CVE-2026-29794",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-29794",
      "aliases": [
        "CVE-2026-29794",
        "GHSA-m547-hp4w-j6jx",
        "GO-2026-4791"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-vikunja/vikunja",
              "type": "GIT",
              "events": [
                {
                  "introduced": "021ee48ec3ee4e39616e717a71ccd5f20aba91dd"
                },
                {
                  "fixed": "b365be1881641dd2791d3dff4c26ad941c13cef6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.8"
                      },
                      {
                        "fixed": "2.2.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.8"
                      },
                      {
                        "fixed": "2.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.1.0",
            "v2.0.0",
            "v1.1.0",
            "v1.0.0",
            "v1.0.0-rc4",
            "v1.0.0-rc3",
            "v1.0.0-rc2",
            "v1.0.0-rc1",
            "v1.0.0-rc0",
            "v0.24.1",
            "v0.23.0",
            "v0.22.1",
            "v0.22.0",
            "v0.21.0",
            "v0.20.4",
            "v0.20.3",
            "v0.20.1",
            "v0.20.0",
            "v0.19.2",
            "v0.19.1",
            "v0.19.0",
            "v0.18.1",
            "v0.18.0",
            "v0.17.0",
            "v0.16.0",
            "v0.15.0",
            "v0.14.0",
            "v0.13",
            "v0.12",
            "v0.11",
            "v0.10",
            "v0.9",
            "v0.8"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29794.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.750714410Z",
      "provider": "osv",
      "references": [
        "https://vikunja.io/changelog/vikunja-v2.2.0-was-released",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29794.json",
        "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m547-hp4w-j6jx",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-29794"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-807"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29794.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-29794",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491472,
  "published_at": "2026-03-20T14:39:59.035+00:00"
}