Description
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.
No analysis available yet.
Remediation
No remediation available yet.
Tracking
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Advisories
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References
History
Sat, 29 Aug 2026 14:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | BookStack before 26.05.4 Remote Code Execution via Book Cover | |
| First Time appeared |
Bookstackapp
Bookstackapp bookstack |
|
| Weaknesses | CWE-434 | |
| CPEs | cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Bookstackapp
Bookstackapp bookstack |
|
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-08-29T13:47:53.312Z
Reserved: 2026-08-29T13:22:57.885Z
Link: CVE-2026-82450
No data.
Status : Received
Published: 2026-08-29T14:16:37.930
Modified: 2026-08-29T14:16:37.930
Link: CVE-2026-82450
No data.
OpenCVE Enrichment
Updated: 2026-08-29T15:30:04Z
Weaknesses
-
CWE-434
Unrestricted Upload of File with Dangerous Type