Vulnerability in Bookstackapp Bookstack
CVE-2020-26260
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.008 (56.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000
Affected products
- Bookstackapp Bookstack — versions >= v0.7, < v0.30.5
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7cr (Third Party Advisory)
- bookstackapp.com/blog/beta-release-v0-30-5/ (Vendor Advisory)
- github.com/BookStackApp/BookStack/releases/tag/v0.30.5 (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2020-26260?
- CVE-2020-26260 is a medium-severity vulnerability in Bookstackapp Bookstack, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.4/10. Published 2020-12-09.
- How severe is CVE-2020-26260?
- Medium severity. CVSS v3 base score is 6.4 out of 10.
- Is CVE-2020-26260 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.