CVE-2025-62796: PrivateBin is missing HTML sanitization of attached filename in file size hint

CVE-2025-62796 · Severity: medium · CVSS 5.8 · Published 2025-10-28

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.

Technologies: privatebin/privatebin (Packagist). Vendors: Packagist.

Quick answers

Is CVE-2025-62796 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-62796 being exploited in the wild.
How severe is CVE-2025-62796?
Medium severity, with a CVSS score of 5.8, published 28 October 2025.
Which products and versions are affected?
privatebin/privatebin (Packagist) ECOSYSTEM:introduced=1.7.7,fixed=2.0.2.
Is there a fix for CVE-2025-62796?
Yes. privatebin/privatebin (Packagist): upgrade to 2.0.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-62796?
Check whether you run privatebin/privatebin (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • privatebin/privatebin (Packagist): upgrade to 2.0.2 or later
    composer require privatebin/privatebin:^2.0.2

Affected products

  • privatebin/privatebin (Packagist) ECOSYSTEM:introduced=1.7.7,fixed=2.0.2

Identifiers

  • CVE-2025-62796
  • GHSA-867c-p784-5q6g

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