Medium severity · published Dec 9, 2020
CVE-2020-26260
BookStack is a platform for storing and organising information and documentation
6.4
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BO
Bookstack · Bookstackapp
before 0.30.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-26260
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-26260
Vendor Advisory
https://bookstackapp.com/blog/beta-release-v0-30-5/
Release Notes
https://github.com/BookStackApp/BookStack/releases/tag/v0.30.5
Third Party Advisory
https://github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7cr
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