CVE-2020-5256 is a critical vulnerability affecting BookStack versions prior to 0.25.5, allowing authenticated users to upload malicious PHP files disguised as images. This remote code execution flaw grants attackers the permissions of the PHP process on the host system. With a CVSS score of 8.8 (HIGH), the vulnerability has a low attack complexity and can lead to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, public exploit code, or significant community discussion, immediate patching to version 0.25.5 or higher is strongly recommended to mitigate this severe risk.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.25.3CPE matchmatch criteria | cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.