CVE-2026-82450
8.7
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bookstackapp | bookstack | 0 < 26.05.4 | affected |
Weaknesses
- CWE-434: Unrestricted Upload of File with Dangerous Type
References
- https://github.com/BookStackApp/BookStack/commit/e210cc32e4cbb1efeae5c5c9d0fef8e3c6a752e6
- https://github.com/BookStackApp/BookStack
- https://www.vulncheck.com/advisories/bookstack-before-26.05.4-remote-code-execution-via-book-cover
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