CVE-2026-33583 — HIGH (8.7)

Vulnerability Description

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.

CVSS Score

8.7

HIGH

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Related Weaknesses (CWE)

CWE-749

References

https://www.cvcn.gov.it/cvcn/cve/CVE-2026-33583

FAQ

What is CVE-2026-33583?

CVE-2026-33583 is a vulnerability with a CVSS score of 8.7 (HIGH). 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 Agr...

How severe is CVE-2026-33583?

CVE-2026-33583 has been rated HIGH with a CVSS base score of 8.7/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33583?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.