CVE-2020-26260 json
Server Side Request Forgery in BookStack
published 2020-12-09 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18849
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 58%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
0.84% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 5.5 | AV:N/AC:L/Au:S/C:P/I:P/A:N |
Affected products
- BookStackApp BookStack
Classification
- Weakness
-
- CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component
References
-
bookstackapp.com
/blog/beta-release-v0-30-5/
vendor-advisory
-
github.com
/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7cr
third-party-advisory
-
github.com
/BookStackApp/BookStack/releases/tag/v0.30.5
release-notes, third-party-advisory
Sources
- CVE List CVE-2020-26260
- NVD CVE-2020-26260
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