CVE-2020-26211
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.10%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.7 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- EPSS
- 1.10% probability · 64th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- bookstackapp/bookstack
- Source
- security-advisories@github.com
References
- https://github.com/BookStackApp/BookStack/commit/bbd1384acbe7e52c21f89af69f2dc391c95dbf54Patch, Third Party Advisory
- https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4Release Notes, Third Party Advisory
- https://github.com/BookStackApp/BookStack/security/advisories/GHSA-r2cf-8778-3jgpThird Party Advisory
- https://www.bookstackapp.com/blog/beta-release-v0-30-4/Patch, Vendor Advisory
- https://github.com/BookStackApp/BookStack/commit/bbd1384acbe7e52c21f89af69f2dc391c95dbf54Patch, Third Party Advisory
- https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4Release Notes, Third Party Advisory
- https://github.com/BookStackApp/BookStack/security/advisories/GHSA-r2cf-8778-3jgpThird Party Advisory
- https://www.bookstackapp.com/blog/beta-release-v0-30-4/Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.