Auth bypass in Themoos Core-Moos
CVE-2026-85428
MOOS core-moos through 10.4.0 contains an authentication bypass vulnerability in the optional MOOSDB HTTP server that allows unauthenticated clients to write variables. Attackers can send HTTP requests with variable names and values to the MOOSDB HTTP server port to modify MOOS variables including actuator and override commands without authentication.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (56.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/themoos/core-moos (Product, product)
- github.com/themoos/core-moos/blob/ec9c77c68fcbdef8f5e4c60fe243acd223433f0c/Core… (technical-description, Issue Tracking)
- github.com/themoos/core-moos/commit/7e3aecdbf5fe47980ea9399340c77940991a6fa5 (Patch, patch, Issue Tracking)
- github.com/themoos/core-moos/pull/77 (issue-tracking, Patch, patch, Issue Tracking)
- www.vulncheck.com/advisories/moos-core-moos-through-10.4.0-moosdb-http-server-u… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-85428?
- CVE-2026-85428 is a critical-severity vulnerability in Themoos Core-Moos, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-09-03.
- How severe is CVE-2026-85428?
- Critical severity. CVSS v3 base score is 9.8 out of 10.