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CVE-2026-75431

CriticalPublished

PowerJob Server version 5.1.2 (and likely earlier) uses a predictable JWT signing key for HS256-based authentication. This allows a remote attacker to...

Published: Sep 4, 2026
Updated: Sep 4, 2026
Assigning CNA: mitre
Evidence observed: Sep 4, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.8%

Low · next 30 days

Percentile: 53.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

PowerJob Server version 5.1.2 (and likely earlier) uses a predictable JWT signing key for HS256-based authentication. This allows a remote attacker to execute arbitrary code.

Sources

CVE-2026-75431_PowerJob_jwt_key_predictablePoC
Demonstrates a critical JWT signing key predictability vulnerability in PowerJob Server, allowing offline key derivation and token forgery for admin takeover and OpenAPI authentication bypass.

Responsible use

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