Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1jaDM3LWNoOHctY2Zycc4AAmfP

Bookstack Cross-site Scripting vulnerability

In BookStack before version 0.30.4, a user with permissions to edit a page could insert JavaScript code through the use of javascript: URIs within a link or form which would run, within the context of the current page, when clicked or submitted. Additionally, a user with permissions to edit a page could insert a particular meta tag which could be used to silently redirect users to a alternative location upon visit of a page. Dangerous content may remain in the database but will be removed before being displayed on a page. If you think this could have been exploited the linked advisory provides a SQL query to test. As a workaround without upgrading, page edit permissions could be limited to only those that are trusted until you can upgrade although this will not address existing exploitation of this vulnerability. The issue is fixed in BookStack version 0.30.4.

Permalink: https://github.com/advisories/GHSA-ch37-ch8w-cfrq
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1jaDM3LWNoOHctY2Zycc4AAmfP
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 2 years ago
Updated: over 1 year ago

CVSS Score: 8.7
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Identifiers: GHSA-ch37-ch8w-cfrq, CVE-2020-26211
References:

• https://github.com/BookStackApp/BookStack/security/advisories/GHSA-r2cf-8778-3jgp
• https://nvd.nist.gov/vuln/detail/CVE-2020-26211
• https://github.com/BookStackApp/BookStack/commit/bbd1384acbe7e52c21f89af69f2dc391c95dbf54
• https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4
• https://www.bookstackapp.com/blog/beta-release-v0-30-4/
• https://github.com/advisories/GHSA-ch37-ch8w-cfrq

Repository: https://github.com/BookStackApp/BookStack
Blast Radius: 1.0

Affected Packages