CVE-2026-33583
CWE-749Published: May 13, 2026· Updated: May 14, 2026
Official 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.
Technical Analysis
CVE-2026-33583 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.7.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
CVSS v3.1 Vector Breakdown
Exploit & PoC Resources
All References (1)
Quick Facts
Related CVEs (CWE-749)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-33583 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts