Auth bypass in Will-Moss Isaiah
CVE-2026-15541
A flaw has been found in will-moss Isaiah up to 1.36.9. The impacted element is the function Server.Handle of the file app/server/server/server.go of the component Master Websocket Handler. Executing a manipulation of the argument Agent can lead to missing authorization. It is possible to launch the attack remotely. The pull request to fix this issue awaits acceptance.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (44.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.9% 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: 0.005 · change: 0.000
Affected products
- Will-Moss Isaiah — versions 1.36.0, 1.36.1, 1.36.2
Weakness classification (CWE)
References
- vuldb.com/vuln/377891 (technical-description, vdb-entry)
- vuldb.com/vuln/377891/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-15541 (third-party-advisory)
- vuldb.com/submit/855074 (third-party-advisory)
- github.com/will-moss/isaiah/issues/34 (issue-tracking)
- github.com/will-moss/isaiah/pull/35 (issue-tracking, patch)
- github.com/will-moss/isaiah/ (product)
Frequently asked questions
- What is CVE-2026-15541?
- CVE-2026-15541 is a high-severity vulnerability in Will-Moss Isaiah, classified under Missing Authorization. CVSS score: 7.3/10. Published 2026-07-13.
- How severe is CVE-2026-15541?
- High severity. CVSS v3 base score is 7.3 out of 10.