CVE-2020-26260

MediumCVSS 6.4/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-74

Affected software

Vendor	Product	Versions
BookStackApp	BookStack	>= v0.7, < v0.30.5

References

https://bookstackapp.com/blog/beta-release-v0-30-5/Vendor Advisory
https://github.com/BookStackApp/BookStack/releases/tag/v0.30.5Release Notes, Third Party Advisory
https://github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7crThird Party Advisory
https://bookstackapp.com/blog/beta-release-v0-30-5/Vendor Advisory
https://github.com/BookStackApp/BookStack/releases/tag/v0.30.5Release Notes, Third Party Advisory
https://github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7crThird Party Advisory

Timeline

Published: Dec 9, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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