{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-78209 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-78209 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-78209 is a high-severity vulnerability in exceljs, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-78209 and fix it if it is affected.\n\nWhat it is: CVE-2026-78209 is a high-severity vulnerability in exceljs, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-78209 in the wild and no public exploit code.\n\nAffected product: exceljs. 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-2026-78209/ (Markdown: https://insights.sbomify.com/CVE-2026-78209/index.md)","id":"CVE-2026-78209","markdown":"https://insights.sbomify.com/CVE-2026-78209/index.md","name":"CVE-2026-78209","record":{"aliases":["GHSA-4w2g-jrqm-g99q","GHSA-9wxc-4rhw-hfrw"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript Excel library","requires_auth":"none","summary":"Attackers can inject malicious formulas into CSV exports via unescaped cell values, leading to data exfiltration or code execution when opened in spreadsheet apps.","user_interaction":"required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.4,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-1236","name":"Improper Neutralization of Formula Elements in a CSV File"}],"description":"exceljs through 4.4.0 fails to neutralize leading equals, plus, minus, or at signs in cell values written to CSV output. Attackers who can influence exported cell values can inject formulas that execute when the CSV file is opened in a spreadsheet application, potentially exfiltrating data or performing other malicious actions.","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":"exceljs through 4.4.0 CSV Formula Injection via Unescaped Cell Values","id":"CVE-2026-78209","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"Missing authorization in Octopus Server","id":"CVE-2026-78210"},"packages":[],"prev":{"headline":"exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename","id":"CVE-2026-78208"},"products":["exceljs"],"published":"2026-08-24","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":"partial"},"state":"PUBLISHED","updated":"2026-08-29","vendors":["exceljs"]},"summary":"Attackers can inject malicious formulas into CSV exports via unescaped cell values, leading to data exfiltration or code execution when opened in spreadsheet apps.","url":"https://insights.sbomify.com/CVE-2026-78209/"}