Auth bypass in Libnoname Noname
CVE-2026-123208
noname Electron desktop build v1.11.2 through v1.11.6.1 contains an unauthenticated local file server with wildcard CORS that allows malicious websites to read, overwrite, or delete installation files. Attackers can send cross-origin requests to /writeFile on localhost port 8089 to overwrite renderer scripts, executing JavaScript with Node.js access as the local user.
Vulnerability class: Broken Authentication
Published .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/libnoname/noname/blob/0b7e4be4b6ef64ab8579b2ffc643a2a626e4fede/apps/… (technical-description)
- github.com/libnoname/noname/blob/0b7e4be4b6ef64ab8579b2ffc643a2a626e4fede/packa… (technical-description)
- github.com/libnoname/noname/commit/b5793c5abdc957a3a2c0ad44abfc4849f3ac3219 (patch)
- github.com/libnoname/noname/issues/4524 (issue-tracking)
- github.com/libnoname/noname/pull/4606 (issue-tracking, patch)
- VulnCheck Advisory: noname v1.11.2 through v1.11.6.1 Missing Authentication in Electron Local File Server (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123208?
- CVE-2026-123208 is a high-severity vulnerability in Libnoname Noname, classified under Missing Authentication for Critical Function. CVSS score: 8.8/10. Published 2026-11-05.
- How severe is CVE-2026-123208?
- High severity. CVSS v3 base score is 8.8 out of 10.