CVE-2026-89026

Issabel Framework Hard-coded JWT Key RCE via pbxapi/manager/originate

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

Issabel Foundation · Issabel Framework

CVSS v4.0 VULNCHECK

9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 VULNCHECK

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

EPSS

0.69% chance of exploitation in the next 30 days, 52nd percentile

Published

2026-09-15

Updated

2026-09-17

Proof-of-concept exploits (2)

• AranFarzami/CVE-2026-890261★ · 2026-09-21
• im-hanzou/CVE-2026-89026

References

• CVE Record
• NVD entry

Related

• CVE-2023-28121
• CVE-2025-14847
• CVE-2026-3844