---
id: CVE-2026-55696
title: >-
  PrivateBin is an online pastebin where the server has zero knowledge of pasted
  data
summary: >-
  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
  getBlobU…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cwe:
  - CWE-79
  - CWE-80
vendor: privatebin
product: privatebin/privatebin
affected:
  - privatebin/privatebin <= 2.0.4
patched:
  - privatebin/privatebin 2.0.5
published: '2026-08-28'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55696'
references:
  - url: >-
      https://github.com/PrivateBin/PrivateBin/commit/7f1f40853efe0eb12db9cc4a30ea8524ac00f423
    label: security-advisories@github.com
  - url: 'https://github.com/PrivateBin/PrivateBin/releases/tag/2.0.5'
    label: security-advisories@github.com
  - url: >-
      https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-f2xf-7x3g-4272
    label: security-advisories@github.com
  - url: >-
      https://github.com/PrivateBin/PrivateBin/commit/e0dd4c025c19a182b6a4c6fb77a8bf81ceff6899
  - url: 'https://github.com/advisories/GHSA-f2xf-7x3g-4272'
tags:
  - nvd
  - ghsa
  - composer
epss: 0.00224
epssPercentile: 0.13293
aliases:
  - GHSA-f2xf-7x3g-4272
ecosystem: composer
ingestedAt: '2026-08-28T20:24:59.724Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55696)

Affected packages:

- `privatebin/privatebin <= 2.0.4`

Patched in:

- `privatebin/privatebin 2.0.5`

Source: https://github.com/advisories/GHSA-f2xf-7x3g-4272