{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-82450 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-82450 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-82450 is a high-severity vulnerability in bookstackapp bookstack, published on 29 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-82450 and fix it if it is affected.\n\nWhat it is: CVE-2026-82450 is a high-severity vulnerability in bookstackapp bookstack, published on 29 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-82450 in the wild and no public exploit code.\n\nAffected product: bookstackapp bookstack. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-82450/ (Markdown: https://insights.sbomify.com/CVE-2026-82450/index.md)","id":"CVE-2026-82450","markdown":"https://insights.sbomify.com/CVE-2026-82450/index.md","name":"CVE-2026-82450","record":{"aliases":["GHSA-jgmr-x24h-q8jj"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"BookStack documentation","requires_auth":"low_privilege","summary":"Attackers with import permissions can upload malicious PHP files as book covers to achieve remote code execution on BookStack instances.","user_interaction":"not_required","vuln_class":"file_upload"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"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","version":"4.0"},"cwes":[{"id":"CWE-434","name":"Unrestricted Upload of File with Dangerous Type"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"BookStack before 26.05.4 Remote Code Execution via Book Cover","id":"CVE-2026-82450","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"file_upload","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Formwork \u003c 2.3.11 Stored XSS via Referer Header","id":"CVE-2026-82451"},"packages":[],"prev":{"headline":"Cockpit CMS before 2.14.1 Account Enumeration via Auth Timing","id":"CVE-2026-82449"},"products":["bookstack"],"published":"2026-08-29","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["bookstackapp"]},"summary":"Attackers with import permissions can upload malicious PHP files as book covers to achieve remote code execution on BookStack instances.","url":"https://insights.sbomify.com/CVE-2026-82450/"}