How severe is CVE-2023-0456?

CVE-2023-0456 has a CVSS 3.x base score of 7.4, 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-2023-0456 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-0456?

CVE-2023-0456 affects Redhat Apicast. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-0456?

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.

When was CVE-2023-0456 published?

CVE-2023-0456 was published on 2023-09-27 and last updated on 2026-06-17.

CVE-2023-0456

CVE-2023-0456 is a high-severity vulnerability in Redhat Apicast with a CVSS 3.x base score of 7.4. 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-862.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Redhat Apicast
Published: 2023-09-27
Last modified: 2026-06-17

Description

A flaw was found in APICast, when 3Scale's OIDC module does not properly evaluate the response to a mismatched token from a separate realm. This could allow a separate realm to be accessible to an attacker, permitting access to unauthorized information.

Frequently asked questions

What is CVE-2023-0456?: A flaw was found in APICast, when 3Scale's OIDC module does not properly evaluate the response to a mismatched token from a separate realm. This could allow a separate realm to be accessible to an attacker, permitting access to unauthorized information.
How severe is CVE-2023-0456?: CVE-2023-0456 has a CVSS 3.x base score of 7.4, 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-2023-0456 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-0456?: CVE-2023-0456 affects Redhat Apicast. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-0456?: 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.
When was CVE-2023-0456 published?: CVE-2023-0456 was published on 2023-09-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:redhat:apicast:*:*:*:*:*:*:*:*

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