---
id: CVE-2026-15541
title: A flaw has been found in will-moss Isaiah up to 1.36.9
summary: >-
  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 …
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-862
  - CWE-863
published: '2026-07-13'
updated: '2026-07-13'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15541'
references:
  - url: 'https://github.com/will-moss/isaiah/'
    label: cna@vuldb.com
  - url: 'https://github.com/will-moss/isaiah/issues/34'
    label: cna@vuldb.com
  - url: 'https://github.com/will-moss/isaiah/pull/35'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-15541'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/855074'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/377891'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/377891/cti'
    label: cna@vuldb.com
tags:
  - nvd
ingestedAt: '2026-07-13T09:25:33.032Z'
epss: 0.00543
epssPercentile: 0.44547
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.