High severity7.9NVD Advisory· Published Mar 9, 2020· Updated Jun 17, 2026
CVE-2020-5256
CVE-2020-5256
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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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
ssddanbrown/bookstackPackagist | < 0.25.5 | 0.25.5 |
Affected products
3- Range: < 0.25.5
Patches
Vulnerability mechanics
References
6- github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5hxnvdThird Party AdvisoryWEB
- github.com/advisories/GHSA-g9rq-x4fj-f5hxghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-5256ghsaADVISORY
- github.com/BookStackApp/BookStack/releases/tag/v0.25.3nvdRelease NotesWEB
- github.com/BookStackApp/BookStack/releases/tag/v0.25.4nvdRelease NotesWEB
- github.com/BookStackApp/BookStack/releases/tag/v0.25.5nvdRelease NotesWEB
News mentions
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