# CVE-2026-55696

## Summary

- **CVE ID:** CVE-2026-55696
- **Severity:** MEDIUM
- **CVSS Score:** 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)
- **CWE:** CWE-79, CWE-80
- **Published:** Aug 28, 2026
- **Last Modified:** Aug 31, 2026

## Description

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.

## Affected Products

- PrivateBin — PrivateBin (< 2.0.5)

## References

- [CNA](https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-f2xf-7x3g-4272)
- [CNA](https://github.com/PrivateBin/PrivateBin/commit/7f1f40853efe0eb12db9cc4a30ea8524ac00f423)
- [CNA](https://github.com/PrivateBin/PrivateBin/releases/tag/2.0.5)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.22%
- **EPSS Percentile:** 12.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._