{"id":"CVE-2026-55696","summary":"PrivateBin: Stored Cross-Side-Scripting (XSS) vulnerability in attachment download link via dangerous MIME types with required user-interaction","details":"PrivateBin is an online pastebin where the server has zero knowledge of pasted data. Prior to 2.0.5, AttachmentViewer.setAttachment in js/privatebin.js uses getAttachmentMimeType to accept attacker-controlled MIME types and uses getBlobUrl to create a same-origin blob before setting attachmentLink's href for the Download attachment link. The SVG-only sanitization branch updates only the preview blob, so text/html, image/svg, application/xhtml+xml, and text/xml attachments can remain active in the download blob. On an instance with fileupload = true and a weakened, stripped, or absent Content Security Policy, an anonymous attacker can create such an attachment, and a victim who opens the link in a new tab causes inline JavaScript to execute in the PrivateBin origin. The script can read origin-scoped local storage and issue same-origin requests, including requests to applications co-hosted on the same domain. This issue is fixed in version 2.0.5.","aliases":["GHSA-f2xf-7x3g-4272"],"modified":"2026-09-02T03:30:23.907278600Z","published":"2026-08-28T20:20:53.934Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79","CWE-80"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55696.json"},"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-2026-55696.json"},{"type":"ADVISORY","url":"https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-f2xf-7x3g-4272"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55696"},{"type":"FIX","url":"https://github.com/PrivateBin/PrivateBin/commit/7f1f40853efe0eb12db9cc4a30ea8524ac00f423"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/privatebin/privatebin","events":[{"introduced":"0"},{"fixed":"7f1f40853efe0eb12db9cc4a30ea8524ac00f423"},{"fixed":"3035d6e5d3cceb7f06f7b7bb80968727879c52b0"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.0.5"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["2.0.4","1.7.8","2.0.3","2.0.2","2.0.1","2.0.0","1.7.7","1.7.6","1.7.5","1.7.3","1.7.2","1.7.1","1.7.0","1.6.2","1.6.1","1.6.0","1.5.2","1.5.1","1.5.0","1.4.0","1.3.5","1.3.4","1.3.3","1.3.2","1.2.1","1.3.1","1.3","1.1","1.0","0.22","0.21.1","0.21","0.20","0.19","0.18"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55696.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N"}]}