PrivateBin up to 2.0.1 Content Security Policy attachment_name cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in PrivateBin up to 2.0.1. Affected by this issue is some unknown functionality of the component Content Security Policy Handler. The manipulation of the argument attachment_name results in cross site scripting. This vulnerability is reported as CVE-2025-62796. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in PrivateBin up to 2.0.1. It has been classified as problematic. Affected is an unknown code block of the component Content Security Policy Handler. The manipulation of the argument attachment_name with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This is going to have an impact on integrity. CVE summarizes:

PrivateBin is an online pastebin where the server has zero knowledge of pasted data. Versions 1.7.7 through 2.0.1 allow persistent HTML injection via the unsanitized attachment filename (attachment_name) when attachments are enabled. An attacker can modify attachment_name before encryption so that, after decryption, arbitrary HTML is inserted unescaped into the page near the file size hint, enabling redirect (e.g., meta refresh) and site defacement and related phishing attacks. Script execution is normally blocked by the recommended Content Security Policy, limiting confidentiality impact. The issue was introduced in 1.7.7 and fixed in 2.0.2. Update to 2.0.2 or later. Workarounds include enforcing the recommended CSP, deploying PrivateBin on a separate domain, or disabling attachments.

The advisory is available at github.com. This vulnerability is traded as CVE-2025-62796 since 10/22/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. 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 2.0.2 eliminates this vulnerability.

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Productinfo

Name

• PrivateBin

Version

• 2.0.0
• 2.0.1

Website

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

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