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CVE-2020-5256 Details

Description

BookStack before version 0.25.5 has a vulnerability where a user could upload PHP files through image upload functions, which would allow them to execute code on the host system remotely. They would then have the permissions of the PHP process. This most impacts scenarios where non-trusted users are given permission to upload images in any area of the application. The issue was addressed in a series of patches in versions 0.25.3, 0.25.4 and 0.25.5. Users should upgrade to at least v0.25.5 to avoid this vulnerability.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:7.9 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/BookStackApp/BookStack/releases/tag/v0.25.3	CVE	Release Notes
https://github.com/BookStackApp/BookStack/releases/tag/v0.25.4	CVE	Release Notes
https://github.com/BookStackApp/BookStack/releases/tag/v0.25.5	CVE	Release Notes
https://github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5hx	CVE	Third Party Advisory
https://github.com/BookStackApp/BookStack/releases/tag/v0.25.3	[email protected]	Release Notes
https://github.com/BookStackApp/BookStack/releases/tag/v0.25.4	[email protected]	Release Notes
https://github.com/BookStackApp/BookStack/releases/tag/v0.25.5	[email protected]	Release Notes
https://github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5hx	[email protected]	Third Party Advisory

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-434	Unrestricted Upload of File with Dangerous Type	[email protected]
CWE-95	Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')	[email protected]

Affected Products

Product	Versions
bookstackapp bookstack	< 0.25.3
CPE cpe:2.3:a:bookstackapp:bookstack:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Mar 10, 2020	Initial Analysis	[email protected]