---
title: "CVE-2026-89026: Issabel Framework - Authentication Bypass"
description: "Issabel Framework before commit b97dbaf contains a hard-coded HS256 JWT signing key in pbxapi index.php, letting unauthenticated remote attackers forge tokens to execute arbitrary OS commands as Asterisk user."
url: https://panop.io/threat-heartbeat/CVE-2026-89026/
---

# CVE-2026-89026 Issabel Framework - Authentication Bypass

Issabel Framework before commit b97dbaf contains a hard-coded HS256 JWT signing key in pbxapi index.php, letting unauthenticated remote attackers forge tokens to execute arbitrary OS commands as Asterisk user.

CVSS base score 9.8 /10

Critical

CISA KEV

Exploited in the wild

Public exploit

Proof of concept available

Authentication

Not required

EPSS

0.69% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89026)

## Details

Type

Authentication Bypass

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-321](https://cwe.mitre.org/data/definitions/321.html)

## Vendor fix

Update to the version after commit b97dbaf or latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89026](https://nvd.nist.gov/vuln/detail/CVE-2026-89026)
- [https://github.com/IssabelFoundation/framework/commit/b97dbaf0b71c1c36f841e672b664afbeb02773bd](https://github.com/IssabelFoundation/framework/commit/b97dbaf0b71c1c36f841e672b664afbeb02773bd)
- [https://www.vulncheck.com/advisories/issabel-pbx-hard-coded-jwt-key-rce-via-pbxapi-manager-originate](https://www.vulncheck.com/advisories/issabel-pbx-hard-coded-jwt-key-rce-via-pbxapi-manager-originate)
- [https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-21&host\_type=src&vulnerability=cve-2026-89026](https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-21&host_type=src&vulnerability=cve-2026-89026)
- [https://www.cve.org/CVERecord?id=CVE-2026-89026](https://www.cve.org/CVERecord?id=CVE-2026-89026)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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