CVE•Published 2026-09-09•Modified 2026-09-09•1 article on news•5 live references•NVD data
CVE-2026-86099
Vulnerability data via NVD (ingested)
CVSS v3.1
8.2
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
EPSS percentile
—
Weaknesses (CWE)
Description
Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolute or relative path sequences. Attackers can craft malicious sessionId values that escape the upload directory and recursively delete arbitrary directories accessible to the service process.
Timeline
Published 2026-09-09
Modified 2026-09-09
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-2026-86099Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-86099Censys host search filtered to this CVE id.
grep.app
CVE-2026-86099Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-86099GitHub code search for direct mentions.
Google dork
"CVE-2026-86099" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-86099 on GitHub.