CVE-2026-33583

High

Published: 13 May 2026

Published

13 May 2026

Modified

14 May 2026

KEV Added

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Patch

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CVSS Score v3.1 8.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

EPSS Score 0.0021 11.0th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-33583 is a high-severity Exposed Dangerous Method or Function (CWE-749) vulnerability in Gov (inferred from references). Its CVSS base score is 8.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 11.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-30113

Vulnerability details

Exposure of the QKEY (used as input into the ‘OTA-Quantum’ device registration process) and internal system keys via an unauthenticated and unencrypted HTTP GET method in the Arqit Symmetric Key Agreement Platform. This issue affects Symmetric Key Agreement Platform: before…

26.03.

CWE(s): CWE-749

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1552 Unsecured Credentials Credential Access

Adversaries may search compromised systems to find and obtain insecurely stored credentials.

attack.mitre.org →

Why these techniques?

Unauthenticated HTTP exposure of sensitive keys (QKEY/system keys) on public-facing platform directly enables T1190 (initial access via public app exploit) and T1552 (unsecured credential/key access).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0