What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-09 · updated 2026-06-17
• Weakness: CWE-74

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.

Affected products

• bookstackapp/bookstack: before 0.30.5 — fixed in 0.30.5

How to fix

Upgrade to a fixed version: bookstackapp/bookstack 0.30.5. Check the vendor advisory for mitigations.

References

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

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