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High

BookStack before 26.05.4 Remote Code Execution via Book Cover

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-82450

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-82450

bookstack

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "bookstackapp",
    "product": "bookstack",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "26.05.4",
        "versionType": "custom"
      }
    ],
    "packageURL": "pkg:composer/ssddanbrown/bookstack",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-82450

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#13003 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement