{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "0.12.9"
              },
              {
                "fixed": "0.12.9"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0dc12f23edda47b9e6336c3b1d85687442225055"
            }
          ],
          "repo": "https://github.com/pixelfed/pixelfed",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86178.json"
  },
  "details": "Pixelfed through 0.12.9 fails to validate follower status in StoryComposeController react and comment endpoints, allowing authenticated users to access follower-only stories. Attackers can enumerate sequential story IDs and submit reactions or comments to retrieve story media URLs and author information without following the account.",
  "id": "CVE-2026-86178",
  "modified": "2026-09-07T03:30:46.470478732Z",
  "published": "2026-09-05T11:01:28.748Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86178.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86178"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/pixelfed-through-0.12.9-unauthorized-story-access-via-api"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pixelfed/pixelfed"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L487-L501"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L566-L580"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/pixelfed/pixelfed/blob/v0.12.9/routes/web-api.php#L154-L155"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/geo-chen/oss/blob/main/Pixelfed.md"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Pixelfed through 0.12.9 Unauthorized Story Access via API"
}