How severe is CVE-2026-50631?

CVE-2026-50631 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-2026-50631 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-50631?

CVE-2026-50631 affects Apache Cxf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-50631?

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-2026-50631 have an EU (EUVD) identifier?

Yes. CVE-2026-50631 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36399.

When was CVE-2026-50631 published?

CVE-2026-50631 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-50631

CVE-2026-50631 is a high-severity vulnerability in Apache Cxf 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-367.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36399
Weakness: CWE-367
Affected product: Apache Cxf
Published: 2026-06-12
Last modified: 2026-06-17

Description

A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh token can be replayed concurrently by multiple attackers or threads. Users are recommended to upgrade to versions 4.2.2 or 4.1.7, which fixes this issue.

Frequently asked questions

What is CVE-2026-50631?: A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh token can be replayed concurrently by multiple attackers or threads. Users are recommended to upgrade to versions 4.2.2 or 4.1.7, which fixes this issue.
How severe is CVE-2026-50631?: CVE-2026-50631 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-2026-50631 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-50631?: CVE-2026-50631 affects Apache Cxf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-50631?: 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-2026-50631 have an EU (EUVD) identifier?: Yes. CVE-2026-50631 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36399.
When was CVE-2026-50631 published?: CVE-2026-50631 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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