EUVD-2026-67654
GHSA-jhp3-fv3p-rj5c
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:C/RE:L/U:Red
Network-reachable and unauthenticated (AV:N/PR:N/UI:N), but requires a specific 2-legged-OAuth + AbstractAdapterCredentialsFilter configuration, so AC:H; authz bypass yields high C/I, no availability impact.
Primary rating from Vendor (eclipse).
CVSS VectorVendor: eclipse
Lifecycle Timeline
4DescriptionCVE.org
In Eclipse Lyo versions 2.0.0 to 7.0.0, OAuth server authorization checks can be bypassed when the 2-legged auth is supported by the server. In those cases, application that based their authz filters upon Lyo-provided AbstractAdapterCredentialsFilter, are vulnerable. An attacked can create a provisional trusted client (valid use-case) but then it can be used as a trusted client immediately without requiring the administrator approval to clear the provisional status. The 3-legged path requiring user interaction is not vulnerable and rejects provisional clients.
AnalysisAI
Authorization bypass in Eclipse Lyo 2.0.0 through 7.0.0 lets remote attackers abuse the 2-legged OAuth flow to promote a self-registered 'provisional' trusted client into a fully trusted one without the required administrator approval. Applications that build their authorization filters on Lyo's AbstractAdapterCredentialsFilter are affected, allowing an attacker to act as a trusted OAuth client and access protected OSLC resources. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target server (1) enables/supports the 2-legged OAuth flow, and (2) bases its authorization filters on Lyo's AbstractAdapterCredentialsFilter - both are explicit prerequisites from the description and correspond to the CVSS AT:P attack requirement. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 base score is 9.1 (AV:N/AC:L/AT:P/PR:N/UI:N with high confidentiality and integrity impact), reflecting a network-reachable, unauthenticated authorization bypass - a serious combination. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to a fixed release: Vendor-released patch: 6.0.1.Final for the 6.x line (https://github.com/eclipse-lyo/lyo/releases/tag/v6.0.1.Final), or 7.0.0.Beta3 for the 7.x line (https://github.com/eclipse-lyo/lyo/releases/tag/v7.0.0.Beta3). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems deploying Eclipse Lyo versions 2.0.0 through 7.0.0 and identify which applications depend on it for authorization. …
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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