PrivateBin up to 2.0.4 Attachment Sanitization js/privatebin.js AttachmentViewer.setAttachment cross site scripting

Summaryinfo

A vulnerability was found in PrivateBin up to 2.0.4. It has been declared as problematic. Impacted is the function AttachmentViewer.setAttachment of the file js/privatebin.js of the component Attachment Sanitization. Such manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-55696. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in PrivateBin up to 2.0.4. It has been rated as problematic. Affected by this issue is the function AttachmentViewer.setAttachment of the file js/privatebin.js of the component Attachment Sanitization. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-55696 since 06/17/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 2.0.5 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• PrivateBin

Version

• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4

Website

• Product: https://github.com/PrivateBin/PrivateBin/

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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