CVE Catalog

CVE-2026-89026

CriticalCVSS 9.8
Published: Translated: NVD NIST

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 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.

Risk Assessment

This vulnerability allows unauthenticated remote attackers to execute arbitrary OS commands on the PBX server, potentially leading to full compromise of the telecommunication system.

Recommendation

Update Issabel Framework to a version containing commit b97dbaf or later to remove the hard-coded JWT key.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS