CVE-2026-33583Network attack vector

Unauthenticated key disclosure via unencrypted HTTP GET

Published May 13, 2026 · Updated May 13, 2026

Information disclosure in Arqit SKA-Platform before 26.03 allows remote attackers to retrieve QKEY and internal system keys. SKA-Platform returns the QKEY used by OTA-Quantum device registration and internal system keys through an unauthenticated, unencrypted HTTP GET request. The request requires no credentials or user interaction; disclosure reveals device-registration input and internal cryptographic secrets.

CVSS severity8.7
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Arqit SKA-Platform before 26.03 allows remote attackers to retrieve QKEY and internal system keys. SKA-Platform returns the QKEY used by OTA-Quantum device registration and internal system keys through an unauthenticated, unencrypted HTTP GET request. The request requires no credentials or user interaction; disclosure reveals device-registration input and internal cryptographic secrets.

The record

CVE
CVE-2026-33583
Published
May 13, 2026
Updated
May 13, 2026
Vendor
Arqit Quantum Inc.
Product
SKA-Platform
Classifications
CWE-749, T1552.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <26.03

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arqit Quantum Inc. · SKA-Platformversion=0 <26.03

Published CVSS scores

8.7ENISACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-749Exposed Dangerous Method or Function
T1552.004Unsecured Credentials: Private Keys

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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