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VULNERABILITIES

CVE-2026-82450 Details

UNDERGOING ENRICHMENT

The CVE is currently being enriched by the Volerion team. The enrichment process results in the association of reference link tags, CVSS, and CPE applicability statement data.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NDDVolerionCVSS-B:…Vector:This vulnerability is currently being analyzed.
CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/BookStackApp/BookStack [email protected]
https://github.com/BookStackApp/BookStack/commit/e210cc32e4cbb1efeae5c5c9d0fef8e3c6a752e6 [email protected]
https://www.vulncheck.com/advisories/bookstack-before-26.05.4-remote-code-execution-via-book-cover [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-434Unrestricted Upload of File with Dangerous Type[email protected]

Affected Products

This vulnerability is currently being analyzed

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-82450
NVD Published Date:
Aug 29, 2026
NVD Last Modified:
Aug 31, 2026
Source:
[email protected]
CVE-2026-82450 Details - Not Deferred