Authentication Bypass in org.apache.cxf:cxf-rt-rs-security-oauth2 (CVE-2026-50623)
Summary
Authentication bypass in org.apache.cxf:cxf-rt-rs-security-oauth2 (CVE-2026-50623). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 4.1.7 or later.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-50623 has been found in org.apache.cxf:cxf-rt-rs-security-oauth2.
Risk of unauthorized operations or information disclosure. CVSS score: 4.8/10.
What to do: upgrade org.apache.cxf:cxf-rt-rs-security-oauth2 to 4.1.7 or later.
If unsure, ask your IT team or search "org.apache.cxf:cxf-rt-rs-security-oauth2 CVE-2026-50623" on the vendor's site.
CVE-2026-50623 (org.apache.cxf:cxf-rt-rs-security-oauth2) — CWE-287 / CVSS v3 4.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 4.1.7 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Authentication bypass (CWE-287) exists in org.apache.cxf:cxf-rt-rs-security-oauth2.
Check the vendor advisory for the affected versions of org.apache.cxf:cxf-rt-rs-security-oauth2.
Severity: Medium (CVSS 4.8/10). Risk of unauthorized operations or information disclosure.
Update to 4.1.7.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで org.apache.cxf:cxf-rt-rs-security-oauth2 を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade org.apache.cxf:cxf-rt-rs-security-oauth2 to 4.1.7ステージング環境で 4.1.7 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web lists.apache.org
- web openwall.com
- web github.com