CVE•Published 2026-08-29•Modified 2026-08-31•1 article on news•5 live references•NVD data
CVE-2026-82450
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
—
Weaknesses (CWE)
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.
Timeline
Published 2026-08-29
Modified 2026-08-31
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-82450Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-82450Censys host search filtered to this CVE id.
grep.app
CVE-2026-82450Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-82450GitHub code search for direct mentions.
Google dork
"CVE-2026-82450" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-82450 on GitHub.