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Vulnerability record · CVE-2026-18918 · published 28 August 2026

CVE-2026-18918: Incorrect authorization vulnerability

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.

9.1 CVSS 4.0 Critical EPSS 0.37% · top 71.3% CWE-863 · Incorrect authorization Deferred
9.1CVSS 4.0 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
1 Sep 2026Last modified by NVD

Description

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.

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:

References

LinkTags
https://github.com/eclipse-lyo/lyo/releases/tag/v6.0.1.Final
https://github.com/eclipse-lyo/lyo/releases/tag/v7.0.0.Beta3
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/221

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Source: NIST National Vulnerability Database (record CVE-2026-18918), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.