CVE-2020-5256

HIGH Year: 2020
CVSS v3 Score
8.8
High
CVSS v2 Score
9.0
Critical
Weakness Type
CWE-95
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Vulnerability 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.

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