How severe is CVE-2026-33583?

CVE-2026-33583 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-33583 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-33583?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33583 have an EU (EUVD) identifier?

Yes. CVE-2026-33583 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30113.

When was CVE-2026-33583 published?

CVE-2026-33583 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-33583

CVE-2026-33583 is a high-severity vulnerability with a CVSS 3.x base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-749.

Key facts

Severity: High (CVSS 3.x base score 8.7)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30113
Weakness: CWE-749
Published: 2026-05-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33583?: 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.
How severe is CVE-2026-33583?: CVE-2026-33583 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-33583 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-33583?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33583 have an EU (EUVD) identifier?: Yes. CVE-2026-33583 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30113.
When was CVE-2026-33583 published?: CVE-2026-33583 was published on 2026-05-13 and last updated on 2026-06-17.

References

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

Other CWE-749 vulnerabilities

CVE-2023-40151 — Critical (CVSS 10.0): When user authentication is not enabled the shell can execute commands with the highest privileges. Red Lion SixTRAK…
CVE-2026-55454 — Critical (CVSS 9.9): Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 2.1, the bundled Caddy…
CVE-2026-30957 — Critical (CVSS 9.9): OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, OneUptime Synthetic Monitors…
CVE-2026-30921 — Critical (CVSS 9.9): OneUptime is a solution for monitoring and managing online services. Prior to 10.0.20, OneUptime Synthetic Monitors…
CVE-2019-18342 — Critical (CVSS 9.9): A vulnerability has been identified in Control Center Server (CCS) (All versions < V1.5.0). The SFTP service (default…
CVE-2025-59403 — Critical (CVSS 9.8): The Flock Safety Android Collins application (aka com.flocksafety.android.collins) 6.35.31 for Android lacks…

Browse all CWE-749 vulnerabilities →