{"cve":"CVE-2020-26260","nvd":{"published":"2020-12-09T17:15:30.477","modified":"2026-06-17T03:07:56.707","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","score":6.4},"cwes":["CWE-74"],"references":["https://bookstackapp.com/blog/beta-release-v0-30-5/","https://github.com/BookStackApp/BookStack/releases/tag/v0.30.5","https://github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7cr","https://bookstackapp.com/blog/beta-release-v0-30-5/","https://github.com/BookStackApp/BookStack/releases/tag/v0.30.5"],"products":["bookstackapp:bookstack"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2020-26260","score":0.00837,"percentile":0.57783,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}