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Critical CVE-2026-89026 in Issabel Framework Under Active Exploitation

Critical CVE-2026-89026 in Issabel Framework Under Active Exploitation

First seen 16 Sep 2026, 17:33 UTC • •
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ThreatCluster AI
ThreatCluster •September 16, 2026 at 18:53 UTC
  • •CVE-2026-89026 allows unauthenticated RCE via forged JWT tokens.
  • •Active exploitation confirmed since September 9, 2026, by Shadowserver.
  • •Patch released on August 1, 2026; users must update immediately.

A severe vulnerability (CVE-2026-89026) in the Issabel Framework has been discovered, allowing unauthenticated remote attackers to execute arbitrary OS commands. This flaw stems from a hard-coded JSON Web Token (JWT) signing key, which can be exploited to forge valid bearer tokens. The vulnerability has a CVSS score of 9.8, indicating its critical nature. Active exploitation was first observed by the Shadowserver Foundation on September 9, 2026. A patch was released on August 1, 2026, to mitigate the issue by replacing the hard-coded key. Users of the Issabel Framework are urged to apply the patch immediately to prevent potential attacks. Details on the scale of exploitation or the attackers remain unclear. The vulnerability affects all installations of the Issabel Framework due to the identical hard-coded key.

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Timeline

2026-08-01
Patch released
A patch was issued to replace the hard-coded JWT key in the Issabel Framework.
Thehackernews
2026-09-09
Exploitation observed in the wild
The Shadowserver Foundation confirmed active exploitation of CVE-2026-89026.
Thehackernews
2026-09-15
CVE-2026-89026 published
The critical vulnerability in the Issabel Framework was officially disclosed, rated CVSS 9.8.
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Extracted Entities (12)

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