EUVD-2026-68105
GHSA-jgmr-x24h-q8jj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-exploitable with low privileges; scope changes because the stored PHP file executes under the web server context, extending impact beyond the BookStack application boundary.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
BookStack before 26.05.4 contains a remote code execution vulnerability in the portable ZIP import functionality that allows users with Import Content and Create Books permissions to upload a PHP polyglot file as a book cover. Attackers can bypass image extension validation by embedding a PHP file with a .php filename in the ZIP archive, which is stored in the public web root and executed by unauthenticated requests.
AnalysisAI
Remote code execution in BookStack before 26.05.4 stems from a missing MIME-type enforcement gate in the portable ZIP import pipeline, allowing authenticated users with Import Content and Create Books permissions to store a PHP webshell directly in the public web root. The import runner extracts the attacker-supplied .php file from the ZIP archive and places it in the publicly accessible image storage path without validating the file type against a supported image MIME allowlist, because the cover field used the generic fileReferenceRule() rather than imageFileReferenceRule(). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated BookStack account explicitly granted both the 'Import Content' permission and the 'Create Books' permission - these are non-default assignments that an administrator must deliberately configure for a role. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H) accurately captures the core risk profile: the attack path is low-complexity, requires no special server configuration, and yields full server-side code execution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade BookStack to version 26.05.4 or later, which incorporates the fix at commit e210cc32e4cbb1efeae5c5c9d0fef8e3c6a752e6 (https://github.com/BookStackApp/BookStack/commit/e210cc32e4cbb1efeae5c5c9d0fef8e3c6a752e6). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all BookStack deployments and their current versions to assess exposure. …
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External POC / Exploit Code
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