Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck
CVE-2026-89026Issabel Framework Hard-coded JWT Key RCE via pbxapi/manager/originate
Critical 9.8
In plain English
A critical-severity security flaw in Issabel Framework from Issabel Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.7% (higher than 86% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code.
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Issabel Foundation | Issabel Framework | 0 – before b97dbaf0b71c1c36f841e672b664afbeb02773bd |
Weakness: CWE-321 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H