How severe is CVE-2026-50623?

CVE-2026-50623 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-50623 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-50623?

CVE-2026-50623 affects Apache Cxf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-50623?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-50623 have an EU (EUVD) identifier?

Yes. CVE-2026-50623 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36393.

When was CVE-2026-50623 published?

CVE-2026-50623 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-50623

CVE-2026-50623 is a medium-severity vulnerability in Apache Cxf with a CVSS 3.x base score of 4.8. 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-287.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36393
Weakness: CWE-287
Affected product: Apache Cxf
Published: 2026-06-12
Last modified: 2026-06-17

Description

An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint (/services/oauth2/introspect) can be accessed by any unauthenticated network attacker. However note that this is a safeguard only in the case that someone forgot to enable authentication on the service. Users are recommended to upgrade to version 4.2.2 or 4.1.7, which fixes this issue.

Frequently asked questions

What is CVE-2026-50623?: An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint (/services/oauth2/introspect) can be accessed by any unauthenticated network attacker. However note that this is a safeguard only in the case that someone forgot to enable authentication on the service. Users are recommended to upgrade to version 4.2.2 or 4.1.7, which fixes this issue.
How severe is CVE-2026-50623?: CVE-2026-50623 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-50623 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-50623?: CVE-2026-50623 affects Apache Cxf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-50623?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-50623 have an EU (EUVD) identifier?: Yes. CVE-2026-50623 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36393.
When was CVE-2026-50623 published?: CVE-2026-50623 was published on 2026-06-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*

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