{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.9.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ce789255b1f42edfc9f286690d223352263468b3"
            }
          ],
          "repo": "https://github.com/ellite/wallos",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-gr2w-m9v4-qm3v"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-352"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54599.json"
  },
  "details": "Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.9.4, login.php generates an OIDC state nonce stored in $_SESSION['oidc_state'], but checksession.php dispatches the OIDC callback without comparing the incoming state against the session value. An attacker can trick a victim into visiting a crafted URL, causing Wallos to exchange the attacker's authorization code and log the victim into the attacker's account. This issue has been patched in version 4.9.4.",
  "id": "CVE-2026-54599",
  "modified": "2026-09-10T03:30:59.271243474Z",
  "published": "2026-08-31T20:30:30.913Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ellite/Wallos/releases/tag/v4.9.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54599.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ellite/Wallos/security/advisories/GHSA-gr2w-m9v4-qm3v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54599"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Wallos: OIDC state parameter never validated — login CSRF / account takeover"
}