CVE-2020-26260

09.12.2020, 17:15

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.

Injection

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	6.4 MEDIUM	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
GitHub_M	CNA	6.4 MEDIUM	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CVE	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 53%

Vendor	Product	Version
bookstackapp	bookstack	𝑥 < 0.30.5

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

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