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CVE-2026-89026 (GCVE-0-2026-89026)

Vulnerability from cvelistv5 – Published: 2026-09-15 16:41 – Updated: 2026-09-15 16:41 X_Open Source X_Known Exploited Vulnerability
VLAI Previdian
Title
Issabel Framework Hard-coded JWT Key RCE via pbxapi/manager/originate
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.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-321 - Use of Hard-coded Cryptographic Key
Assigner
References
Impacted products
Vendor Product Version CPE status
Issabel Foundation Issabel Framework Affected: 0 , < b97dbaf0b71c1c36f841e672b664afbeb02773bd (git)
guessed Create a notification for this product.
Date Public
2026-07-31 00:00
Credits
The Shadowserver Foundation
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c306c704-d4c2-42b1-9868-8974a4751715

Vulnerability ID: CVE-2026-89026

Status: Confirmed

Status Updated: 2026-09-15 16:50 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-15
Asserted: 2026-09-15
Scope
Notes: Issabel Framework Hard-coded JWT Key RCE via pbxapi/manager/originate | Affected: Issabel / Issabel Framework | CVSS: 9.3 (CRITICAL) | EPSS: 0.00521 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Issabel Framework Hard-coded JWT Key RCE via pbxapi/manager/originate
Cve Id CVE-2026-89026
Vendor Issabel
Ghsa Id GHSA-MMRG-2GJG-78X9
Product Issabel Framework
Added Date 2026-09-15T16:50:29.618Z
Cvss Score 9.3
Epss Score 0.00521
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.42998
Used In Malware unknown
Vulnerability Id CVE-2026-89026
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-09-16 17:00 UTC | Updated: 2026-09-16 17:00 UTC
Show details on NVD website
To clipboard 

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  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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