p PatchFirst

CVE-2026-55696

CVE-2026-55696 · PrivateBin: Stored Cross-Side-Scripting (XSS) vulnerability in attachment download link via dangerous MIME types with required user-interaction

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 4.3 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: php

Affected products and versions

  • privatebin

    Versions
    • < 2.0.5: Affected

    No fix published

  • privatebin/privatebin Packagist

    Versions
    • 1.0
    • 1.1
    • 1.1.1
    • 1.2
    • 1.2.1
    • 1.2.2
    • 1.2.3
    • 1.3
    • 1.3.1
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.3.5
    • 1.4.0
    • 1.5.0
    • 1.5.1
    • 1.5.2
    • 1.6.0
    • 1.6.1
    • 1.6.2
    • 1.7.0
    • 1.7.1
    • 1.7.2
    • 1.7.3
    • 1.7.4
    • 1.7.5
    • 1.7.6
    • 1.7.7
    • 1.7.8
    • 1.7.9
    • 2.0.0
    • 2.0.1
    • 2.0.2
    • 2.0.3
    • 2.0.4
    Affected ranges
    • ECOSYSTEM: < 2.0.5

    Update to 2.0.5

Original sources

Check your server →