CVE-2020-5256
moderate-risk
Published 2020-03-09
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.
Do I need to act?
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0.68% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.9/10
High
NETWORK
/ HIGH complexity
Affected Products (1)
Affected Vendors
References (8)
Third Party Advisory
https://github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5h...
Third Party Advisory
https://github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5h...
31
/ 100
moderate-risk
Severity
24/34 · High
Exploitability
2/34 · Minimal
Exposure
5/34 · Minimal