AUGUST 14, 2026
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Case File

CVE-2026-5430

CRITICAL · CVSS 10 EPSS 0.22% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-06 · Last synced 2026-08-14

CyberRota Analysis

AI-Generated

The vulnerability in the JWT authentication mechanism allows attackers to exploit unsupported signing algorithms, leading to incorrect validation of tokens and potential unauthorized access to systems. This critical flaw can result in full account takeover, including administrative privileges, making it imperative for organizations using JWT for authentication to prioritize remediation. All entities relying on this authentication method should assess their configurations and implement necessary safeguards immediately.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

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CVE
CVE-2026-5430
Severity
CRITICAL
CVSS
10
EPSS
0.22%

Original NVD Description

The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker to craft a JWT with an unsupported algorithm, which is then incorrectly validated, leading to unauthorized access. Successful exploitation of this vulnerability may result in unauthorized access to the system, including the potential compromise of administrative accounts and full account takeover. The CVSS score is adjusted to 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) in single-tenant deployments, reflecting that the impact is contained within a single security authority boundary.

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