{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55891","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-17T16:59:42.760Z","datePublished":"2026-08-28T20:23:50.477Z","dateUpdated":"2026-08-31T18:47:39.096Z"},"containers":{"cna":{"title":"PrivateBin: Reflected JSON injection in backend responses via unescaped REQUEST_URI","problemTypes":[{"descriptions":[{"cweId":"CWE-116","lang":"en","description":"CWE-116: Improper Encoding or Escaping of Output","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":0,"baseSeverity":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-xrjc-c68j-hp7w","tags":["x_refsource_CONFIRM"],"url":"https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-xrjc-c68j-hp7w"},{"name":"https://github.com/PrivateBin/PrivateBin/commit/164c839c39688533ef0086575878e8392cd21249","tags":["x_refsource_MISC"],"url":"https://github.com/PrivateBin/PrivateBin/commit/164c839c39688533ef0086575878e8392cd21249"},{"name":"https://github.com/PrivateBin/PrivateBin/releases/tag/2.0.5","tags":["x_refsource_MISC"],"url":"https://github.com/PrivateBin/PrivateBin/releases/tag/2.0.5"}],"affected":[{"vendor":"PrivateBin","product":"PrivateBin","versions":[{"version":"< 2.0.5","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-28T20:23:50.477Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-xrjc-c68j-hp7w","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-xrjc-c68j-hp7w","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-31T18:47:12.873010Z","id":"CVE-2026-55891","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-31T18:47:39.096Z"}}]}}