CVE-2026-50631
Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
CVE-2026-50631: Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing. Not in the CISA KEV catalog. Critical advisory severity.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
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CVE-2026-50631 at a glance
- CISA KEV
- Not listed (catalog checked )
- Highest advisory severity
- Critical
- Fixed releases
- Apache: 4.2.2, 4.1.7, 3.6.12
- VulniPulse record
- Published · Updated
Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-50631; bulletin-wide values are not repeated here.
Is CVE-2026-50631 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-50631 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-50631?
Upgrade to a fixed release named by the vendor:
- Apache: 4.2.2, 4.1.7, 3.6.12
- Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue. (Apache)
Vendor advisory comparison
Apache
1 advisory- Advisory severityUnrated
Advisory [CVE-2026-50631] Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
CVE-2026-50631Source published Source updated
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 or 3.6.12, which fixes this issue. Affected product named by the advisory: Apache CXF.
- Affected products in this advisory
- Apache CXF
- Source-reported affected versions
- Apache CXF 4.2.0 before 4.2.2
- Apache CXF 4.0.0 before 4.1.7
- Apache CXF before 3.6.12
- Source-reported fixed versions
- 4.2.2
- 4.1.7
- 3.6.12
- Mitigation guidance
- Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.
NetApp
1 advisory- Advisory severityCritical9.8
Critical [CVE-2026-49875 +10] June 2026 Apache CXF Vulnerabilities in NetApp Products
NTAP-20260618-0004Source published Source updated
This bulletin covers 11 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.
Multiple NetApp products incorporate Apache CXF. Apache CXF versions prior to 4.1.7 and 4.2.0 prior to 4.2.2 are susceptible to vulnerabilities which when successfully exploited could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). Affected products: Active IQ Unified Manager for Linux, Active IQ Unified Manager for Microsoft Windows, Active IQ Unified Manager for VMware vSphere. NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.
- Affected products in this advisory
- Active IQ Unified Manager for Linux
- Active IQ Unified Manager for Microsoft Windows
- Active IQ Unified Manager for VMware vSphere
- Source-reported affected versions
- 4.1.7
- 4.2.0
- 4.2.2
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
More Apache advisories
- CVE-2026-108039Oct 9, 2026By default, StaxUtils placed no limit on the total number of elements or the total number
- CVE-2026-107938Oct 9, 2026In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client)
- CVE-2026-107937Oct 9, 2026In Apache CXF, the parser for multipart/MTOM attachment part headers did not fully enforce
- CVE-2026-100227Oct 9, 2026Improper Verification of Cryptographic Signature vulnerability in Apache CXF's JAX-RS XML
- CVE-2026-97791Oct 9, 2026In Apache CXF, STSTokenValidator checks whether a SAML assertion is signed by a trusted
- CVE-2026-97468Oct 9, 2026Apache CXF's STSTokenValidator and Security Token Service (STS) cached validated security
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