{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.0.5"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "164c839c39688533ef0086575878e8392cd21249"
            },
            {
              "fixed": "3035d6e5d3cceb7f06f7b7bb80968727879c52b0"
            }
          ],
          "repo": "https://github.com/privatebin/privatebin",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-xrjc-c68j-hp7w"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-116"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55891.json"
  },
  "details": "PrivateBin is an online pastebin where the server has zero knowledge of pasted data. Prior to 2.0.5, Request::getRequestUri() in lib/Request.php passes $_SERVER['REQUEST_URI'] through FILTER_SANITIZE_URL, which does not remove quotation marks, angle brackets, or apostrophes, and Controller::_init() stores the attacker-controlled value in Controller::$_urlBase. Controller::_jsonld() in lib/Controller.php then uses str_replace() to insert that value without JSON escaping into js/types.jsonld, js/paste.jsonld, and the other JSON-LD templates used by /?jsonld= and /?pasteid. A raw quotation mark delivered by an HTTP client, proxy, or structured-data crawler that does not normalize the request target can break out of the JSON string and inject arbitrary key-value data into a CORS-open application/ld+json response. The jsonld branch in Controller::__construct() returns before _setCacheHeaders(), so the response also lacks X-Content-Type-Options: nosniff, Content Security Policy, X-Frame-Options, and Referrer-Policy. Direct script execution was not demonstrated, but manipulated responses can affect structured-data consumers or combine with less strict clients. This issue is fixed in version 2.0.5.",
  "id": "CVE-2026-55891",
  "modified": "2026-08-30T03:30:32.721362937Z",
  "published": "2026-08-28T20:23:50.477Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/PrivateBin/PrivateBin/releases/tag/2.0.5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55891.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-xrjc-c68j-hp7w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55891"
    },
    {
      "type": "FIX",
      "url": "https://github.com/PrivateBin/PrivateBin/commit/164c839c39688533ef0086575878e8392cd21249"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "PrivateBin: Reflected JSON injection in backend responses via unescaped REQUEST_URI"
}