CVE-2026-89026

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-15. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 17, 2026

Advisory Details (2)

Auto-updated Sep 17, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

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

https://www.vulncheck.com/advisories/issabel-pbx-hard-coded-jwt-key-rce-via-pbxapi-manager-originate
github_commit

commit b97dbaf0b71c (IssabelFoundation/framework)

Fix landed in IssabelFoundation/framework commit b97dbaf0b71c — awaiting tagged release

https://github.com/IssabelFoundation/framework/commit/b97dbaf0b71c1c36f841e672b664afbeb02773bd

Vendor Advisories for CVE-2026-89026(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 37× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 16:54 UTCEG score recompute
  2. 2026-09-19 16:54 UTCGHSA enrichment
  3. 2026-09-19 12:52 UTCGHSA enrichment
  4. 2026-09-19 08:50 UTCGHSA enrichment
  5. 2026-09-19 04:46 UTCGHSA enrichment
  6. 2026-09-19 00:43 UTCGHSA enrichment
  7. 2026-09-18 20:41 UTCEG score recompute
  8. 2026-09-18 20:40 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 16:37 UTCGHSA enrichment
  11. 2026-09-18 12:35 UTCGHSA enrichment
  12. 2026-09-18 08:33 UTCGHSA enrichment
  13. 2026-09-18 04:32 UTCGHSA enrichment
  14. 2026-09-18 00:31 UTCGHSA enrichment
  15. 2026-09-17 20:29 UTCEG score recompute
  16. 2026-09-17 20:29 UTCGHSA enrichment
  17. 2026-09-17 19:39 UTCEG score recompute
  18. 2026-09-17 19:39 UTCGHSA enrichment
  19. 2026-09-17 19:32 UTCEPSS rescore
  20. 2026-09-17 19:21 UTCGHSA enrichment
  21. 2026-09-17 14:04 UTCGHSA enrichment
  22. 2026-09-17 10:02 UTCGHSA enrichment
  23. 2026-09-17 05:59 UTCGHSA enrichment
  24. 2026-09-17 01:58 UTCGHSA enrichment
  25. 2026-09-16 21:57 UTCGHSA enrichment
Show 12 more
  1. 2026-09-16 17:55 UTCEG score recompute
  2. 2026-09-16 17:55 UTCGHSA enrichment
  3. 2026-09-16 14:09 UTCEPSS rescore
  4. 2026-09-16 13:49 UTCGHSA enrichment
  5. 2026-09-16 09:43 UTCGHSA enrichment
  6. 2026-09-16 05:40 UTCGHSA enrichment
  7. 2026-09-16 01:39 UTCGHSA enrichment
  8. 2026-09-15 21:37 UTCEG score recompute
  9. 2026-09-15 21:37 UTCGHSA enrichment
  10. 2026-09-15 17:32 UTCEG score recompute
  11. 2026-09-15 16:43 UTCEG score recompute
  12. 2026-09-15 16:42 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-89026?
CVE-2026-89026 is a critical vulnerability published on September 15, 2026. 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…
When was CVE-2026-89026 disclosed?
CVE-2026-89026 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89026 actively exploited?
CVE-2026-89026 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.8% of all scored CVEs.
What is the CVSS score of CVE-2026-89026?
CVE-2026-89026 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-89026?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89026, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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