CVE-2020-26260: medium-severity vulnerability in BookStackApp BookStack
Server Side Request Forgery in BookStack
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.4epss 0.8%
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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Affected products
BookStackApp · BookStackRelated CVEs — BookStackApp BookStack
In the same product, most dangerous first.
CVE-2020-5256HIGHRemote Code Execution Through Image Uploads in BookStackEPSS 2.0%CVE-2020-26210HIGHCross-Site Scripting in BookStackEPSS 1.2%CVE-2020-26211HIGHCross-Site Scripting in BookStackEPSS 1.1%CVE-2020-11055MEDIUMCross-site Scripting in BookStackEPSS 0.8%CVE-2026-67204MEDIUMBookStack < 26.05.4 Broken Access Control via Image Gallery APIEPSS 0.4%CVE-2026-5484MEDIUMBookStackApp BookStack Chapter Export ExportFormatter.php chapterToMarkdown access controlEPSS 0.3%