---
id: CVE-2026-89026
title: >-
  The Issabel Framework, the web framework supporting Issabel PBX software,
  before commit b97dbaf contains a hard-coded HS256 JWT signing key in the
  pbxapi index.php file that is identical across every installation, allowing
  unauthenticate…
summary: >-
  The Issabel Framework, the web framework supporting Issabel PBX software,
  before commit b97dbaf contains a hard-coded HS256 JWT signing key in the
  pbxapi index.php file that is identical across every installation, allowing
  unauthenticate…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-321
vendor: Issabel Foundation
product: Issabel Framework
affected:
  - issabel_framework < b97dbaf0b71c1c36f841e672b664afbeb02773bd
published: '2026-09-15'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:08:55.030'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89026'
references:
  - url: >-
      https://github.com/IssabelFoundation/framework/commit/b97dbaf0b71c1c36f841e672b664afbeb02773bd
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/issabel-pbx-hard-coded-jwt-key-rce-via-pbxapi-manager-originate
    label: disclosure@vulncheck.com
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.00685
epssPercentile: 0.50563
exploits:
  github: 2
  githubRepos:
    - 'https://github.com/cflowsec/CVE-2026-89026'
    - 'https://github.com/AranFarzami/CVE-2026-89026'
  checkedAt: '2026-09-26T09:06:04.504Z'
exploitAvailable: true
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-17T19:18:08.040082Z'
ingestedAt: '2026-09-15T17:41:02.867Z'
---

## Overview

The Issabel Framework, the web framework supporting Issabel PBX software, before commit b97dbaf contains a hard-coded HS256 JWT signing key in the pbxapi index.php file that is identical across every installation, allowing unauthenticated remote attackers to forge valid bearer tokens. Attackers can use the forged token to call the manager originate endpoint with the System application parameter, causing Asterisk to execute arbitrary OS commands as the Asterisk user. Exploitation evidence was first observed by the Shadowserver Foundation on 2026-09-09.

## Remediation

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